How to hide Intellisense "based on recent edits" suggestions?
To turn off the "Based on recent edits" stuff, go to turn off IntelliCode suggestions.
Per the docs:
If you wish to turn it off, choose Tools > Options, IntelliCode General tab, and then switch C# suggestions to Disabled
This will turn off "Based on Recent edits" while still leaving on the other stuff like code styles/autocomplete/etc.