Hi Vignesh V,
Good day! Welcome to Q&A forum.
Are you working on SharePoint online?
To get all unique folder or file permissions of a site in SharePoint online, refer to the following article:
SharePoint Online: Unique Permissions Report using PowerShell - SharePoint Diary
To remove all unique folder or file permissions of a site in SharePoint online, refer to the following article:
Hope these information helps.
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