I used Grav v1.5.10 and Admin v1.8.20 to build a Onepager.
In Admin I was able to set Folder Numeric Prefix to enabled From within a modular child, and then was able to reorder the modular children with drag&drop.
Worked like a charm.
After the update to Grav v1.6.3 it seems this does not work anymore.
I did a fresh install of Grav v1.6.3 and Admin v1.9.0, and also was not able to set a modular childs Folder Numeric Prefix to enabled. When I set Folder Numeric Prefix to enabled in the UI and save it, it changes back to disabled.
Has this feature been removed or am I missing something?