Hi John,

Looks like you use an old AutoCAD version, PURGE dialog was introduced in 2019 version.

If you don't have an ability to use PURGE dialog, you need to find objects with the layer you want to remove manually.

You can also try to use -LAYMGR command to merge layer you want to remove with some other layer.

Can you share your problem drawing here?

I can look at it.