Request a Preferences/Interface/Color Theme which enables a white background surrounding thumbnails. Current behaviour requires a grey box around every image, no matter what theme. This box is distraction.
A decade ago, when I first started using bridge, it was possible to set this box to white, which would match the background and meet my needs. When Adobe removed that feature I used a competing product. I came back, but annoyed (grrr). Do a search on this issue and you will find a number complaints by people like me, who don't like grey boxes around their photos.
See attached image
Hi, @ericlopresti When I first saw your question in my email, I thought, Oh, wait, I know what he needs to do.
So I opened your email in my Browser and saw your screenshot. I have to admit, I have no idea what's going on there because when I have the "Image Backdrop" shoved all the way to the right, I have a white backdrop as shown in my screenshot. I cannot re-create your screenshot in any way I try.
Let's start with the basics, what is your OS (I'm on a Mac using Ventura)
Here's my screenshot (oh, it doesn't make a difference if I'm in the Lightable View or any other workspace):