What file explorer does qBittorrent use? (Debian/KDE)

I really like its format over Dolphin's, I find it much more intuitive. It shows the whole filetree from root and double clicking a folder just expands the it further. This is different than how Dolphin works, which only shows one folder at once like how Windows does in the main windows of File Explorer.

I think I might be autistic.

Specifically qBittorrent used with Debian and KDE. Not sure of it looks different elsewhere.