When enabling Hardened memory allocator on a Pixel Tablet is resets to disabled once you exit out of the menu. So when opening it again it's disabled.
Are the hardend memory alloctor feature available for the Tablet?

    VEECCdYKYi Are you referring to the settings menu in Settings > Security and privacy > Exploit protection > Hardened memory allocator? If so, "Disabled" in that menu does not mean that it's disabled globally, but it's showing a list of apps for which you have disabled it for.

    If I disable hardened memory allocator for app X, then app X will appear in that list.

    VEECCdYKYi Are the hardend memory alloctor feature available for the Tablet?

    Yes.

        Okey.
        Thanks for the answer.
        The UI is maybe slightly confusing. Would probably be better if the UI was something similar in the permissions with two list with the apps in allowed and not allowed.