I noticed the same thing on the Releases list earlier today when I was helping another community member. It appears that the global New UI action isn't used and is overwritten by a custom New button for each of the release tables. In that New UI action is a condition:
RP.isRelatedList()
This is validating whether you are on a related list or not. So the condition is basically only allowing new items IF you are on a related list and not from the main list itself. Seems silly but obviously there was some sort of reason for this by the development team.
To fix:
- Click one of the list column hamburger icons and choose Configure \ UI Actions
- Search where name = New. You should find one for the enhancements table - don't edit the one tied to the global table
- Best practice is to inactivate the out of the box one and clone it for your own so you won't deal with upgrade challenges
- Once cloned remove the "&& RP.isRelatedList()" from the condition field.
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