I reply to both questions with this screenshot: as you see there is a lot of space between the lines in the grid. (I already switched to image view and set vertical space to 0, but this changes the image view only), right click on the list does not have a configure layout command.
As you see I am in the "arcade" platform, in this case I would like to hide automatically the platform column (the first one in this case) in the grid.
Thanks a lot to all of you for the kind support.