Automatically update media pool thumbnails on vertical clip.

Let's say you have 50 clips shot vertically, if you select all of them and change the image orientation via "Right click>Clip Attributes" the thumbnails stay horizontal unless you hover the mouse on each clip.

Sometimes this gets confusing when you have vertical video and horizontal video in the same project.

are you in color page?

If so, try right click on one thumbnail and use "update all thumbnails".

It's not just color page, vertically oriented media is broken in fusion (it's cropped) and gets black bars in edit, and it gets "grey bars" in fairlight.