How to disable encrypt on nextcloud 17

how to disable encryption on nextcloud version 17?

i mean is it enough to remove checkbox (under security for server-side encryption) for enable default encryption module ?

You have to run the OCC commands to decrypt the files and disable encryption.

https://docs.nextcloud.com/server/19/user_manual/files/encrypting_files.html#encryption-faq

https://docs.nextcloud.com//server/latest/admin_manual/configuration_server/occ_command.html#encryption-label