Maybe this drawing will help a little (originally a Pro drawing). It has most everything for the three floors filtered in the Design Director; Basement, 1st Floor and 2nd Floor. Turn the 'eye' off on the main heading and the sub-layers turn off.
The Layer Filters article in the Wiki might help.
Yeah, John, the file and the Wiki article helped a lot; especially the Wiki article. It's not like me to post a question like this without first searching the Wiki- I guess I didn't scroll down far enough in the Wiki after getting my search results.
I now understand what Layer Filters are, and how to utilize them. I also now understand- conceptually
(that's important)- how they differ from Layer Sets.
Seem like for the past many versions, IMSI/Design-TurboCAD has made the decision to move towards being more "compatible"/"interchangeable" with AutoCAD. There are a lot of almost
redundancies now because of that: This Layer Filters vs. Layer Sets is one example; all the "Styles" versus Property Value Preset (legacy versions= "Style"); Door & Window"Styles" and the way we can insert them, vs. the very close "Opening" ; I'm sure I could think of additional.
Once I had wrapped my head around what was happening in the recent versions- that IMSI/Design-TurboCAD was adding "features" that make it more compatible with AutoCAD, but not removing existing features (we now have a lot
of "features" to choose from- many almost-redundant)- I have found my working with the version 19 a little less frustrating (remember- I jumped from ol'-reliable version 11.2 to 19); I just keep telling myself "oh, that "feature" is just there for those who are used to AutoCAD and/or want to import/export to/from AutoCAD- I don't need
to use it.
Anyway- Thanks a bunch John
for posting the link and the file; I now have a thorough understanding of the Layer Filter feature- it seems to be a good "tool", and I might actually move to it from Layer Sets, or use it in conjunction with.