no isocals button on LT, but I typed the command, then I didn't really understand what to do... obviously you have to select the objects on the layer to isolate, or something like that.... but hey, I have hundreds of objects..... I don't see how to do this simple manipulation, but hey as I said I have trouble on this software that I find.... prehistoric and not at all intuitive. that's just my opinion
You have to select an object that is on the layer to be isolated (keep), you can select several objects to keep several layers.
To undo the isolation, use the RELATE Layer command.
I would say that it is especially since the banner interface was adopted that Autocad has lost its approval. It is true that it is a software that has accumulated renovations without really making its revolution, so we have orders that have not changed since the creation of the software (the 80s/90s...) and orders that have appeared by adopting the operating methods of their time.