Hi @mzarchs ,

I was not able to reproduce your problem in AutoCAD 2022, but now I opened your drawing in 2019 version and I am able to reproduce the issue with window selection on my side.

I have found that the case of the problem is Helvetica True Type font used in HELVETICA text style in your drawing:

 As soon as I change Helvetica True Type font to something else, such as Helvetica Neue or Arial, the problem with window selection gone away in 2019 version.