If you installed as an admin it is in the ProgramData folder. Otherwise I think it is in your user appdata directory? I don't recall where exactly it is. C:\Users/<yourUsername>\AppData\Local?
Jellyfin 10.10.6 (Docker)
Ubuntu 24.04 LTS
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
3x WD Red Pro 6TB CMR in RAIDZ1 (JF Library)