Modify Hybrid Map
Take this as start: https://geojson.io/#id=gist:derekhe/47e3c6229c86309cdbf6d3020a4245a6&map=1.5/40.1/44.6
Use draw polygon to define the area you want to use. Add a property “map” and set the map name.

The map names are listed here, please use the listed sources otherwise it won’t work:
- AppleMap
- ArcGIS
- BingMaps
- ChinaHD2021
- ChinaHD2022
- GoogleMapsServer1
- GoogleMapsServer2
- GoogleMapsServerFree
- MapboxPro
Save the region and override the hybrid-map.json
file inside the installation folder. Restart the app and test in MSFS2020’s world map see if it works.