We actively made this change. Previously, F11 was mapped to both Fullscreen and the Step Into function in the debugger and was a bit inconsistent. Alt-F11 should now activate Fullscreen at any time on Windows. F11 in the Script Editor is trying to activate debugger functionality. If you’re not stopped at a breakpoint, it may seem like it’s not doing anything . You can check File > Advanced > Customize Shortcuts and search for “F11” to see other modifier combinations with this key.