Even selecting things in the UI has sucked. I went in and increased the selection radius or whatever, that helped. But really, should I need to do this as a new user?
Getting the constraints to behave is like pulling teeth.
It also kind of sucks that you have to have really sparse sketches that only contain one closed figure. I gather you can create a "master sketch" and selectively project geometry into other sketches. But the last few times I've tried the app, I haven't gotten far enough into my sketches before rage quitting to validate the technique.
Right now I am back F360 with their hobby license wanting to escape their regular messing with the terms and conditions.