Block Restriction with beaver builder will only available if you activate Beaver Builder Restriction from Add-ons.
You need to keep Beaver Builder Plugin Installed and active to allow block restriction for beaver builder with ARMember plugin.
After activated Addon you can add a block as per your requirements in page/post.
After adding block modules in beaver builder check for ARMember tab in block settings and select “Yes” dropdown option on “Select ARMember access” dropdown
After that you will get a option that who can view a block such as non logged in, logged in member, Member having a specific membership plan.