I'm a MacBook user, and when I'm home I plug into a large external monitor to get additional screen space. When I'm on the go I disconnect and use my laptop's built-in display. For the most part this arrangement works very well; however, I occasionally run into an issue where I'll resize an app on the external, causing it to be too large to fit on the built-in screen when I disconnect.

Most apps don't have a problem decreasing their height automatically or resizing to fit when I click the green orb, but some (like iTunes) don't want to cooperate. How can I resize apps like iTunes without reconnecting to my external?

Here's a screenshot:

  • 9
    Btw, nice infinity effect ;-)
    – Arko
    Apr 6, 2010 at 9:12

5 Answers 5


Hold down the option key while clicking on the green button. This should prevent iTunes from changing to the mini-player, and will resize the window as expected.


For 99% of applications: The green button in the top left of any OS X window is called the "Zoom" button and will resize the window to it's contents so long as it fits in the current resolution. This is the same as choosing Zoom from the Window menu.

For programs such as iTunes that show a completely different mode when you choose Zoom, you can hold the option key when clicking the zoom button to force it to perform the normal zoom action instead of changing modes.


There's an alternative. Use some app such as BetterTouchTool that enables you to resize windows in different ways. On BTT I choose Fn + Option to resize window on top of the mouse.

alt text


Starting with macOS Sierra, you can easily resize a window to fit the display. Move the mouse cursor to any edge of the window until it turns into a bi-directional arrow aligned diagonally (as-shown):

Now, press and hold the Option key and double click/tap to change the size of window to fit the screen.

  • This is what worked for me. And I didn't have to change any system settings, or buy a third party app! Aug 11, 2023 at 15:51

You should try a third party window management add on, it'll really suit your power user style.

Try Cinch, which is a shareware program that adds AeroSnap-like functionality to a mac (like that in windows 7, which allows you to drag a window to the top of the screen to make it maximize, or drag it to either side and make it consume exactly half the screen).

Also Stay is a great app for setting specified locations for windows to exist, and have them be restored to that spot every time the display configuration changes or the app is open. (for example you could set your contact list to always be in the rightmost side consuming a small portion of the screen. Everytime ur IM app is opened or a screen is plugged in or unplugged, it'll move back to it's spot)

you can see some others i found online on this aricle

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .