Confusing Media Offline Thumbnails

I'm just getting started with DaVinci Resolve and working my way through the official tutorial videos. I'm very impressed so far but one thing is really annoying me. I have several projects that display the Media Offline thumbnail even after I've re-linked the original media files. If I open the projects everything is where it should be, but it's extremely frustrating to see those big red warning signs every time I open the Project Manager. Naturally it would also be quite nice to see the video thumbnails instead. Is there something simple that I may have overlooked? I've tried Right Clicking > Update Thumbnails : This seems to work temporarily but the Media Offline thumbnail usually comes back after a while. I know it's a simple thing, but this is driving me nuts. Any suggestions would be greatly appreciated?

My advice, ignore it and move on.

The Project Manager thumbnails have never worked 100% for me since I started using Resolve at version 12.

OK thanks for the quick and honest answer. I'll switch to list view and forget it