While I made the same switch as you and felt like I had to relearn blender, I am now very comfortable with the new controls, and they are much more intuitive. However, if you do want to stay with they 2.79 controls, here’s how you do it:
Go to preferences>keymap. Next in the drop-down bar at the top that currently says blender, click on that and change the ...
As far as the hiding of the strokes goes, I have found a solution:
For whatever reason, the wireframe view was selected.
This problem was solved by selecting any other view in the top right corner (e.g. Solid view).