Disk Inspector reports that 260 GB of files are 'hidden.' What are these files and why is this so large??

I have iMac with 1 Terabyte storage. I just ran "Disk Inspector" and I have 260GB of "Hidden Items."
Have no clue what this is and why this is so large. Any help is appreciated.

They are required system files which are normally hidden to prevent accidental deletion.

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