macOS Sequoia: New option for double-clicking the app title bar

In the macOS system settings, you can specify what happens to an app window when you double-click its title bar. Up to the current version, i.e. macOS 14 Sonoma, there are the options "Minimize", "Zoom" and "No action". Starting with macOS 15 Sequoia, a third option is added: "Fill". This is accompanied by with the new window management under macOS Sequoia, for which you can also drag app windows to the edge of the screen to adjust them. I have summarised below what the individual options of "Double-click on title bar" do.

New from macOS 15 Sequoia: You can now select “Fill” for “Double-click on title bar”. I have summarized what this and the other options do in this guide.
New from macOS 15 Sequoia: You can now select “Fill” for “Double-click on title bar”. I have summarized what this and the other options do in this guide.

Double-click on title bar: Find options for adjusting window size

The individual options are available on the Apple Mac in the System Settings in the menu item Desk & dock They are located in the second section of the "Dock" area. To the right of "Double-click on title bar" you can select the above options using a drop-down menu. There are three options available up to macOS Sonoma and four from macOS Sequoia onwards.

The double-click options in macOS Sonoma (left) and macOS Sequoia (right).
The double-click options in macOS Sonoma (left) and macOS Sequoia (right).

What do each option for customizing the app window mean?

If you haven't yet looked into this window management option in macOS, the difference between "zooming" and "filling" is probably not immediately clear. "Minimizing", on the other hand, might be self-explanatory if you've heard the term before. But so that everyone can fully understand the options, I've written down an explanation for each of them here:

  • To fill: The window is maximized so that it fills the entire area between the menu bar (top) and the dock or display edge (bottom). In width, it fills the display from edge to edge.
  • zoom: Only the height is adjusted to place the window between the top and bottom display borders (menu bar and dock or display edge). The width remains the same as the previous, unadjusted window size.
  • Minimize: The window is placed on the dock and is no longer visible on the display. This is a good alternative to the key combination command+M if it has been assigned a different function by the app you are using.
  • No action: Double-clicking the title bar of an app window has no effect.

Conclusion on the new possibilities for window adjustment

So under macOS 15 Sequoia comes – next to the window tiling or window tiles - the ability to make an app window full screen by double-clicking on its top edge on the Mac. This differs from full screen mode in that the menu bar and dock remain visible, other windows can be dragged in front of the maximized one, and the maximized one can also be easily dragged out of position. As someone who uses a Windows PC in addition to an Apple Mac, I welcome the new features for the integrated window management of macOS 15. They were long overdue.

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In the Sir Apfelot Blog you will find advice, instructions and reviews on Apple products such as the iPhone, iPad, Apple Watch, AirPods, iMac, Mac Pro, Mac Mini and Mac Studio.

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