I have had multiple problems with selecting and editing a pour. The line of the pour is infinitely small so when i zoom in it stays thin. The only way for me to edit the pour is to select a large area that contains the entire pour and then filter select. I think the outline of the pour should have a fixed width as well so you can click on it and edit. I’ve had a few times where i can click on the pour and i can edit it, but it seems to be random to me.
P.s. I found the problem, you need to go to show filled areas in zones and from there you can adjust it. Perhaps this functionality can also be added for when you are not in this setting?