MDM with dual boot - private volume with FileVault

I will soon have to follow an enrolment process with the company MacBook pro (16'' 2021) I've been using (both for home and work activities). I'd like to continue using the current volume for home activities so I created a second APFS volume where I installed a second MacOS for work related activities and the enrolment. Even though FileVault is enabled on my home volume, I can access its content from the new volume. I don't understand this… What approach would you recommend to prevent admins from the work volume to be able to see files and apps from the home volume?