Solved:
Looking at MSFS folders I found in
C:\Users\xxxxx\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packages\Official\OneStore
the two folders:
workingtitle-g1000
and
workingtitle-gx
both folders dated 10 of March
I can’t be sure I put them there by mistake but it seems strange to me; I have a link on the desktop pointing to the Community and I always open this to add the Mods.
However, with these two folders removed, the G1000 has reappeared.