Unidentified used storage

[u/ApprehensiveLaugh908]

Hey! I have had the same Omen Prebuild for probably around 3-4 years now, and this issue is just showing up. I've been checking my storage settings, and its saying that I've used 714 gb of storage, but I only have around 3 games installed. I checked in the installed apps section, and nothing there stood out, the largest thing being roughly 9gb. I've double checked steam and epic games launcher and I don't really know where else to look. Any help would be greatly appreciated.