Hello. My trouble is on open any particle system in new or converted project I get empty particle system window.
I try click Reset Layout in current window or in scene view and this have not sense.
hmm, almost seems like the windows are open in another monitor or so.
You might want to delete the config folder from your project.
I fix my problem using answer by another post
remove configs from:
C:\Users-----Username-----\AppData\Local\UnrealEngine\4.16\Saved\Config\Windows
Make a backup and start with: EditorLayout.ini