Video thumbnails do not exceed 256px

Hi everyone, I recently installed Directory Opus and noticed that the thumbnails of the video files are no more than 256px (as in the native windows explorer). I put Windows 10 in 4K resolution, increase the DPI between 150% and 250% and I notice that the thumbnails of JPG photos scale above 256px but video files don't, they are stuck at 256px.

Is it the same or is there a plugin missing?

I use MediaPreview 1.4.3.429, I disabled it, cleared the thumbnail cache and it's still the same. Only photos generate thumbnails above 256px.

Do you mean they're the same max size in File Explorer, or that they're larger there?