You basically want to adjust the lightmap scale for the objects so that important objects are more detailed and less important objects aren’t.
Select baked lightmap in your view modes, regardless of if lighting is baked or not you should see squares on your objects. This indicates the resolution
What you probably want is to have your distant objects have a good enough quality despite being distant.
So note how tiny the squares are on the far away object. What i reccomend is having the cubes perceptually the same size.
You do this by selecting those objects and finding scale in lightmap.
Then scale the value down.
now the distant structures have a lightmap scale of .5 and .25 respectively. Reducing their resolution and size in the lightmap.
that said you should still not include some objects in the lightmap at all if it’s unnessecary, light probes can do a lot.