You can now switch spacing mode by clicking on the dropdown in the “gap” input, and select Auto.

You can also toggle between Auto or packed spacing mode by double clicking on the alignment grid.

Thanks a lot !

is X still a control for this ?

Yes. You can still click the alignment grid and press X to toggle.

THANKS ! I may be wrong, but I have the impression that the Figma documentation is not up to date…

I find this :

If so, how do I get Figma to update their documentation along with the updates

Thank yout, buddy!

Thanks for reporting! I’ll let the team know and update the docs soon.

Where is ‘gap’ input? Don’t see this option when selecting the parent autolayout group where “space between” used to live.

Gap is the field to the left of the alignment box.
It used to be called “spacing between items” but it’s been renamed to gap to better align with CSS.