Need to show my all personal videos at one place

[TheDreadPirate]

Ok. I re-read your post. So you want to keep your files organized the way they are, but you don't want Jellyfin to show the folders. You just want all your videos at the top of the library, correct?

If I got that right, you will need to add each sub-folder in the "Main" folder in the library's config instead of just point the library at the "Main" folder.