Interface Preferences - canvas border not showing up in workspace

Hi everyone! I'm hoping this is an easy fix and a checkbox I accidentally unclicked. Any and all advice welcome!! For a few weeks now, the border settings I have for photoshop aren't working. I have them set to show a drop shadow border around the canvas since I prefer to keep the workspace color all white (no dark mode for me!)

However, even with these settings like the above, there's no border actually showing up so it's impossible to discern the edge of the canvas:

I've had to switch on a light gray background color until I figure this out.

Does anyone know what could be interfering with the settings to make the border not show? I'm even seeing this after I transferred from my old laptop to a new iMac on a time machine backup. So that says to me it's something that I've done in my preferences, but honestly I'm not sure anymore. Thank you in advance!