I have a 350GB Lightroom Classic catalog I tried to import into Lightroom CC. It's go 50,000 photos, so it quickly filled up the 100GB of my Adobe CC plan. The fact that only part of my photos are synced is tripping up Lightroom and nothing seems to work properly. I will probably need a separate, slimmed down catalog to use with Lightroom Classic and another with Lightroom CC.
I'd like to delete everything uploaded on that 100GB and start anew, but I can't seem to find how to do that.