Ella Walter
If you're having trouble with the preview pane in Mac Mail Sierra, you're not alone. Several users have reported issues with the preview pane disappearing or getting stuck closed. In some cases, the preview pane may not respond to attempts to drag and resize it, or it may not load automatically. While there doesn't seem to be a system-wide fix, some users have found workarounds, such as ensuring they're not in the classic layout, adjusting cursor positioning, and restarting their Mac.
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What You'll Learn
Preview pane stuck closed
If you are unable to open the Preview pane in Sierra Mail, try the following:
First, ensure that you are not in the classic layout. Go to Mail/Preferences and uncheck the classic layout. Then, place your cursor on the far right side of the Mail screen until it turns into a sideways "T" cursor. With the sideways "T" cursor, drag the right-hand edge of the screen to the left. Keep dragging left, even if it looks like nothing is happening, and the Preview Pane should eventually appear. Once a message is selected, the Preview Screen will populate.
If this does not work, try restarting your Mac. If you are using a trackpad, try using a mouse instead to see if the problem is related to the trackpad.
Some users have reported that jiggling the arrow bar around for a while or dragging the arrow up and down the mail list while keeping the trackpad pressed down has helped reveal the preview pane.
Additionally, you can try resetting the Mail layout in Safe Mode. Reboot normally and try again. Please note that booting into Safe Mode can take up to 10 minutes as it involves system cache cleaning, volume verifying, and directory repairing.
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Preview pane disappeared
If the preview pane has disappeared in the Mail app on macOS Sierra, there are a few potential solutions. Firstly, ensure that you are not in the classic layout. Go to Mail/Preferences and uncheck the classic layout option. Next, place your cursor on the far right side of the Mail screen until you see a sideways "T" cursor. Then, drag the right-hand edge of the screen to the left. The preview pane should appear. If this does not work, try restarting your Mac.
If the preview pane is still not appearing, try the following: move your cursor to the divider line between the bottom edge of the message list and the preview pane. Ensure that the cursor changes to the appropriate icon, then click, hold, and drag left. If this does not work, try dragging further left than you would expect, as the preview pane may appear once you reach a certain point.
If you are still unable to get the preview pane to appear, there may be an issue with your trackpad. Try using a mouse to see if the problem persists. If the preview pane still won't appear, you may need to explore more complex solutions, such as editing .plist files or reinstalling the Mail app.
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Preview pane won't auto-load
If the preview pane won't auto-load on Mac Mail Sierra, there are a few potential solutions. Firstly, ensure that you are not in the classic layout. Go to Mail/Preferences and uncheck the classic layout option. Next, place your cursor on the far right side of the Mail screen until it turns into a sideways "T" cursor. With this cursor, drag the right-hand edge of the screen to the left. Initially, it may seem like nothing is happening, but continue dragging left, and the Preview Pane will eventually appear. Once a message is selected, the Preview Screen will populate.
If the above solution does not work, try the following: Mouse over the dot on the right side of the panel until you see a small vertical line with an arrow pointing left. Then, drag the preview pane about 2 to 3 inches to the left. There is usually a short delay before the preview box appears. Alternatively, click and pull upward for 3 to 4 inches. A sustained mouse upward action can help reveal the preview pane.
Another potential solution is to adjust the message list size. You can do this by dragging the bar that separates the message list and the message preview to the left or right. This will resize the message list and may help reveal the preview pane.
If none of these solutions work, you may need to try restarting your Mac or using a different mouse or trackpad to see if the issue is related to your input device.
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Preview pane won't appear after dragging divider
If the Preview Pane won't appear after dragging the divider, there are several fixes you can try. Firstly, ensure that you are not in the classic layout. Go to Mail/Preferences and uncheck the classic layout. Next, place your cursor on the far right side of the Mail screen until you see a sideways "T" cursor. With this cursor, drag the right-hand edge of the screen to the left. Even if it looks like nothing is happening, keep dragging left, and the Preview Pane will eventually appear.
If this does not work, try restarting your Mac. If that still doesn't fix the issue, try restarting File Explorer by right-clicking on the taskbar, selecting 'Task Manager', locating 'Windows Explorer', right-clicking on it, and choosing 'Restart'. You can also try resetting File Explorer settings to default. Open File Explorer Options, click on the 'Restore defaults' button under the General tab, go to the View tab, and click on 'Restore defaults'. Then, hit 'Apply' to save the changes.
Another solution is to change the Performance mode from 'Let Windows choose what's best for my computer' to 'Adjust for best appearance'. Open Windows Search on your PC using the Windows key + S keyboard shortcut, type 'View Advanced system settings', and click on it. From there, you can adjust the Performance mode.
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Preview pane settings
If you're having trouble with the preview pane settings in Mac Mail Sierra, there are several potential solutions. Firstly, ensure that you are not in the classic layout. Go to Mail/Preferences and uncheck the classic layout option. Next, place your cursor on the far right side of the Mail screen until you see a sideways "T" cursor. This indicates that you can now drag the right-hand edge of the screen to the left to reveal the preview pane. Even if it seems like nothing is happening at first, keep dragging left, and the preview pane will eventually appear.
If the above solution doesn't work, there are a few other things you can try. One user suggested that they were able to get the preview pane to reappear by furiously rubbing the arrow up and down the mail list while keeping the trackpad pressed down. Although this may not be the most conventional method, it seemed to work for them.
Additionally, you can try adjusting the preview pane settings by going to the Viewing tab in the Settings menu. Here, you can change the List preview option to display anywhere from none to five lines of the email in the preview. If you're using macOS, you might also want to check your Mail preferences, as there should be an option to always autoload the preview pane.
Another suggestion is to play around with the different layout options in the View menu. Try experimenting with Use Column Layout, Show Side Preview, and Show Bottom Preview to see which layout works best for you. You can also choose to display the sender's profile photo, the time, and the date of incoming emails right in your inbox view by going to the View menu and selecting the appropriate options.
If none of these solutions work, you might need to try more advanced troubleshooting methods, such as moving the ~/Library/Containers/com.apple.mail to your desktop and then deleting the com.apple.mail file if Mail is working properly afterward.
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Frequently asked questions
First, make sure you're not in the classic layout. Go to Mail/Preferences and uncheck the classic layout. Then, place your cursor on the far right side of the Mail screen until you see a sideways "T" cursor. With the sideways "T" cursor, drag the right-hand edge of the screen to the left. Keep dragging left, even if it looks like nothing is happening, and the Preview Pane will appear.
Move your cursor to the divider line between the bottom edge of the message list and the preview pane. Drag the divider line up until it reaches the top of the screen. If it still doesn't appear, try restarting your Mac.
Click Mail from the top menu bar and choose Settings. Go to the Viewing tab and change the List preview option to None, 1, 2, 3, 4, or 5 lines. Note that you can't see line previews if "Use Column Layout" is checked in the View menu.
