i cant figure it out for the life of me im 80% confident its not possible. when im in a fullscreen app like eu4 it bugs and goes grey when swaping between saves. no biggie just relaunch the app id think, but no, its impossible to escape it. no combination of any of the function keys and escape, or f11, or f can get me out of it. so i have to restart it, but when i turn the computer back on i guess macos trys to reopen it so its a grey screen again and then i gotta restart a third time then i can relaunch the app. i know my os is responsive bc i can get to the lock screen fine and its not running hot. if needed its an m1 air. any help would be lover
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The button in the top right of each window is not for minimizing and maximizing the window, but for putting it in and out of fullscreen mode (which is why it covers the menu bar, as you said).
The keyboard shortcut to toggle fullscreen depends on the application.
Most applications that I use on a daily basis (such as Google Chrome, Terminal, Mail, and Safari) use ^+⌘+F (Control+Cmd+F) to toggle fullscreen mode.
Unfortunately, not all developers use this shortcut in their applications. iTerm, for example, uses ⌘+Enter to toggle fullscreen mode. If the application you refer to does not use either of these shortcuts, you should look for the fullscreen option in the View menu or by searching for "fullscreen" in the Help menu.
Try Fn+F, sometimes shown as F
2022 Update: The default shortcut in MacOS (I believe since MacOS 11 "Big Sur") is now Fn+F which "out of the box" seems to work for most applications (at least on my MacBook / Apple Keyboard).
The details described below though can still be helpful if you have applications that are not honoring the Fn+F shortcut or you want to change it to something else, like CMD+CTRL+F
This is very possible.
I did the following and chose CMD+CTRL+F as a shortcut and worked on OSx 10.8 and upwards.
Open System Preferences and click on the”Keyboard” icon Select the “Keyboard Shortcuts” tab and choose ‘Application Shortcuts’ from the list on the left
Click on the + icon to add a new keyboard shortcut for all applications and type the following exactly:
Enter Full Screen (This is the label as shown in the menu of the application)
Now you need to assign it a keyboard shortcut, I chose Command+Control+F because it's the same as the general default that correctly mentioned
Click “Add” and then click on the + icon again, this time typing:
Exit Full Screen
Choose the same keyboard shortcut as you chose before which in effect creates a toggle, and click onto “Add” again
Lastly click on the + icon again, this time typing:
Toggle Full Screen
Again, assign the same key combination of Command+Control+F
As you rightly said, applications like iTerm use this menu option, rather than Enter/Exit Full screen, but assigning to the same key makes it somewhat universal.
If you find an application that has full screen and isn't covered by the above shortcuts, add the menu item as above for that Application and again assign to the same short-cut key and all should be good.

Why is there not shortcut to exit fullscreen mode on any app? I can't even seem to create a shortcut in BetterTouchTools to do so?
