Mac external display not full screen

Not all resolutions translate well to others, and this will cause scaling issues that make some things look elongated or too tall.

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Try setting your display to use the default resolution for the display from the same preferences pane discussed above. If this ever happens to you, Apple suggests booting into Safe Mode on your Mac to see if the settings can be reset to default. Sometimes, an updated version of macOS may include drivers pre-installed, so always make sure macOS is up to date too.


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Sometimes, different external displays will look better with different non-factory color profiles. Play around a bit with these settings until you see something you like. You can typically press them on the monitor itself to adjust the contrast and make colors easier to distinguish between. If the display looks too orange for you, then give it some more green and blue. If it looks too blue for you, give it some more orange and green.

Your eyes use light to distinguish color.

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Do you have dead, bright, or weird pixels? Apple refers to dead or bright pixels in a display as pixel anomalys.


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  • It can also happen when a display gets foreign material trapped between the glass and pixel. These are some of the most common issues that can occur with using an external display on your Mac. External display issues on your Mac? Twenty or thirty years ago there was a huge difference in the user interface, I do not see it any more.

    Maybe for laptops, but I wonder how much serious work you can do on a laptop.

    How to avoid a blank second display when using full-screen mode in an OS X app

    I now use an ipad to do most things on the web, but have a home built Windows for all my Adobe work, and I try not to do much on the web with it. Worked for me. I tried many of the above. This issue only seems to happen to me when I have been using multiple screens earlier in the day. Tonight I just used Airplay to add a second screen. Oriented my second display so I could see off the screen portion of After Effects and resized before disconnecting.

    macos - How can I fill up the entire screen on my external monitor? - Super User

    I figure it out, When it happened, just hold option key and double click bottom-edge of the window, it should works. Made a video tutorial on a super quick solution without clearing your preferences or changing resolution or even plugging back into another monitor. I came here to tell Adobe to fix this already and they should , but you are THE human being. Glad it worked for you! I was ecstatic when I found that it worked for me.

    I stumbled upon it in frustration, when the window appeared at the bottom of the screen I was like, huh? This has been happening to me lately too. I bring up the Displays pref panel, and rotate the offending display 90 degrees. Then, I rotate my brain, so I can move the mouse, grab the problem window, and move it to another monitor. I switch the monitor back to normal, move the window back to its rightful place, and save the workspace. This happens to me almost everytime I unplug my MacBook Pro from my secondary monitor.

    Right now the window is so stretched I can't even grab any of the corners as recommended here. If it is completely off the screen sometimes happens when using an external display that is no longer connected , go to 'window', and turn off 'application frame'.

    Your Answer

    You wont be able to turn it back on until you plug back in the display, unless you save everything, quit, restart. This works for illustrator - not sure if "Application Frame" is a thing in Ae or if its just always like that. I just saw someone with this problem turn the resolution down on their entire display system by making the adjustment from their computer's display settings.

    Once icons and everything were sized down, they were able to pull the After Effects window back into frame, saved the project, and closed it.

    When they reverted their resolution back to normal and opened the project, it was still in the middle of the screen. That used to work, but in Mojave with the latest version of After Effects CC the only solution is to uninstall and reinstall each time you want to launch AE without an external monitor.

    Everytime I try to work on just my laptop after being connected to other monitors I have to go through this whole routine and at the moment, the windows are positioned in such a way where they literally are stuck and none of this will work. Is there a file on my computer that I can delete that will reset my preferences and make my computer forget it was prev connected to other monitors? Also, can adobe please fix this? And let me be a little more specific. After all, at the p resolution that window will take up much of your display. But you can add it after installing SwitchResX on the mini.

    Then restart your mini from within the Screen Sharing window.

    How to Show All Possible Screen Resolutions for a Display in Mac OS X

    That window will show Reconnecting as the mini restarts. Now, the word of caution. Therefore, before attempting to use your mini with your TV, screen share into it and choose p in the Displays system preference. All will then be right with the world or at least with your HDTV.