Hi there!

I was looking for it too and couldn’t find it. I’d say the resize to fit function is only available for a frame without auto layout or for a section. I think it was removed from auto layout. Haven’t been able to find it anywhere else.

Hope it helps!

Well, i’ve just tried to use a shortcut for Resize (Ctrl+Alt+Shift+R) in auto layout and it worked, but still can’t find it on the interface.

You're right, I can't find it either. Though double clicking the bottom or side edge of the frame still seems to work like the shortcut.

The shortcuts (Ctrl+Alt+Shift+R)  work and there is enough space to display them in the panel. I think the Resize button should be visible.