How do I mirror a collection? I have a collection of objects that comprise a room. I would like to 'mirror' it on an X or Y axis. While I can accomplish this with an individual object, I cannot figure out how to do it with a collection.
Update: Still haven't figured it out, but I am just going to align my objects individually until I can figure this out.
you can select all objects in your collection and add a mirror modifier to one of them.

after, use make links

after, you can, use convert to mesh, to apply modifier. To all the meshes