Thank you Asobo,
I have persistent world map filters working
I’ve switched OFF Landmarks, Cities and Fauna as I like to do and turned ON Airspace’s, Navaids and Fix RnAv position and following a flight turned off MSFS2020 and turned off my PC
Switched PC back on and started MSFS2020 and whooo My World Map Filters had remained the same.
So it’s working for me, so thank you once again Asobo