As you can see the house is given this grey color because of the added 'topo' vector layer. The question I have now is, is it possible for me to make the red marker into the vector: I want the whole building to be red. I tried the different symbology settings (raster image, vector field marker etc.) but no luck. It is also (in my understanding) not possible for the vector layer to be rule based because it does not contain the information to be filtered. Maybe combine the vector layer within the other layer that contains the rules?
I can answer the follow-up questions.