Explain the problem as you see it
I can adjust the banner height and width with CSS, but I would appreciate something more straightforward.
(It's irony that we can generate banner images easily with a 16x9 ratio, always, but we cannot tell Tana how much or which part of that image is the banner.)
Why is this a problem for you?
Quality of life
Suggest a solution
Like a command accessible from the contextual menu on banners. The command could pop up a small dialog to set height and width. Pixels I suppose. I'm open to other options.
Or perhaps we could grab the banner image and slew it up and down.