I found this unusual bug that appeared when I just upgraded to UE 4.18. When you click the hide button in your list of levels on the levels tab, it jumps to a different tab. Before this didn’t happen. I know it’s something very minor, but I figure it could become troublesome in the long term. I was able to reproduce this in a new project.
Create new project.
Go to the levels tab.
Add a new level
Hide the level.
Expected: It should remain on the same tab.
Result: It jumps to a different tab if there is opened. In this case, the details tab.