Computer is running Windows 10 Pro 20H2 / OS build 19042.1052 / Windows Feature Experience Pack 120.2212.2020.0
I tried the NtfsDisableEncryption registry suggestion - value was already hex 0. Changed to 1, rebooted, "Encrypt contents to secure data" still grayed out. Changed back to zero, rebooted. "Encrypt contents to secure data" still grayed out.
Tried secpol.msc (local security policy editor) - under Public Key Policies/Encrypting File System, confirmed "No Encrypting File System Policies Defined" .
Tried services.msc and changed EFS to Automatic start, rebooted, "Encrypt contents to secure data" still grayed out.
Multiple reboots, but regardless of the above changes, this option remains still grayed out.
Please advise how to enable grayed out "Encrypt Contents to secure data" button in Windows 10 Pro computer.