There is a minor bug in UMG where the Events section of the Details becomes inaccessible until you scroll up and back down when you have advanced display expanded.
Steps to recreate:
In a new Widget Blueprint create a button
Expand Advanced Options
Deselect and click back on the button in the Variables section and the Events section will no longer be accessible until you scroll up and back down.
It is an inconsequential bug that I’m sure is very low priority but a bug none the less.
I have reproduced this issue and logged a report for it here
You can track the report’s status as the issue is reviewed by our development staff. Please be aware that this issue may not be prioritized or fixed soon.