How to disable missing preview mesh warning?

This is similar to the warning that says that a BP was saved without an engine version. I want to be able to disable these warnings so it is easier to see others.

To disable the empty engine version I can put

[Core.System]
 ZeroEngineVersionWarning=False

in my DefaultEngine.ini.

Where could I find the complete list of warnings and errors?

Anyone know where?

Or better yet, how can I change a preview mesh in a static mesh? I get several of these errors, some even in Epics own Kite demo.