I finally found the resolution settings (again) and I'm pretty sure I now know why I gave up on Bodhi the first time I looked at it. Of the 7 computers here, 2 of them are special-purpose (4K TV and a little Travelmate laptop). The other 5, desktops and laptops, all have a very common screen resolution of FHD, or 1920x1080. Bodhi doesn't offer that resolution.
I think the first time I looked at it, I ended up with a 4:3 aspect ratio. There was no way to get to 16:9, the actual shape of my monitor screens.
With great sadness, I've given up on Bodhi once more. This time I hope to be able to remember why.