Thumbnail previews are fine for some applications, but for File Explorer previews in particular thumbnails are near worthless since they truncate file paths. In my work I often need a dozen or so File Explorer windows open at once and having a vertical list that shows each full file path is essential (having it sorted alphabetically would make it even better).
In tests on Windows 11 Pro 24H2 (26100.4946), if I open 26 File Explorer windows, then it displays a vertical list, so it seems to have a hard-coded 25 window limit for thumbnail previews, or something based on my screen width.
The NumThumbnails reg edit has no effect.
Please, Microsoft, fix and enhance this. Let us set out own max number of thumbnails to preview before it presents a list, and add the option for it to be a sorted list.