John, I created a unique layer name in a test dwg and entered the layer name in the search bar but it doesn't find it. Am I missing something?
Did you allow Windows search to search the file contents?
1. Open File Explorer.
2. Go to File --> Change Folder and search options
3. In the Search tab choose: Always search file and contents...
FYI: Just before I hit post on this I typed:
1. Windows key + E
2. Used my quick access to go to a project folder (my projects top level folder).
3. Hit <F3>
4. Typed: Defpoints
Windows found/listed drawing files (NOTE I also allow for "All subdirectories" in my searches because I cannot remember where I put things and what I type in my specifications so my searches are typically for spec sections or conditions).