1) choose\create any group so that the parent is default (ParentUI)
2) try to change its parent to some other group and click OK - it will still ParenUI

I am new to TMW, so maybe it's a rather dumb question. I have imported some profile for my class. All icons are locked to each other and can be dragged as a whole - except one. I tried to set the parent of that icon to the "Group Anchor", so it will be locked too, but it just doesn't change. I tried to copy the parent field from locked groups, but nothing worked.

Posted by CurseForge user NoobLock2 | Imported from CurseForge issue #1310 | Raw

Right-click-and-drag an icon in the group that you want to change the anchor of to the group you want to anchor it to, and choose the appropriate option.

Posted by CurseForge user Cybeloras