Okay, what am I missing here? I am designing on PC (as I did on TGC1 and TGC2). In the Highlands theme setup, I have maxed 'grasses', and set all terrain types to zero, i.e. fairways, bunkers, etc. I create a hole, add in tee (via brush), fairway (via spline and then filled with brush), rough (via spline), bunkers (via brush), and green (via brush). At a few spots around the edges, computer-generated grasses are intruding into those terrains. The intrusions seem to be worse in the terrains where I have used a brush.
In TGC2, I would simply 'grab' the offending grasses and either move them or delete them. In TGC2019, that's not working. As a test, I tried maxing 'trees', but get the same thing: items are intruding on terrains, but they are uneditable.
I'm surprised that no one else has registered a complaint, so I'm wondering if I'm missing something.
EDIT: I do acknowledge that in TGC1 / 2, it was sometimes difficult to select objects, especially at the edges of fairways, rough, bunkers, and greens. One had to twist and turn and move the cursor ever so slightly, and when this didn't work, one had to delete the terrrain (or move the spline), move the object, and then replace the terrain.