I'm working on making a mask in QGIS to have one area(county A) outlined while the other areas(counties) are under a semipermeable layer. I already know how to do this for one selected area.
But my question is now: Is it possible to create some kind of mask where I simply need to select the county of my choice and the rest is covered? And it would make it a lot easier if I could change between the counties for uncovering by selection without creating a mask for every county I want to highlight. Maybe somebody knows how to do this?
I hope my question is quite clear. If not I will try to be more specific. Thank you for helping :)