2020 Library Temple and Unreal 424 collision issue

Ok so took me all monring to figure out how to fix this , which wasnt broken before...and i had to look at the inventory of the blueprint , then browse to asset then click on edit , hten collision set as complex and hten on right side scroll downa nd make sure it takes ina drop down as in "complex as simple" some reason the collsion button wont take right? anyhow i see at end of this video i got more to do LOL.

p.s. this is what i had to do back 6+ months ago with the brushify assets