When viewing file properties, the Security tab does not appear in the Properties window.

Administrator rights and NTFS support do not guarantee that the Security tab will be displayed. If it is missing for every local file, the most likely cause is the Remove Security tab policy.

First, create a test text file in a normal local folder and check its properties. If the Security tab appears there, the original item may be inside a ZIP file, library, cloud placeholder, or another virtual location. Extract or open the item’s actual local folder.

If the tab is missing from all local files:

1. Press Win + R, enter gpedit.msc, and press Enter.
2. Go to User Configuration > Administrative Templates > Windows Components > File Explorer.
3. Open Remove Security tab.
4. Set it to Disabled or Not Configured.
5. Run gpupdate /force, then sign out and sign back in.

Windows Home does not include Group Policy Editor. In that edition, check the NoSecurityTab value under:

HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer

Also check the same path under HKEY_LOCAL_MACHINE. Delete NoSecurityTab or set it to 0, then restart Windows Explorer.