How to mark reminders as "Done" without going via Google Calendar?

I set reminders using Google / Google Now / Google Assistant (or whatever it's called these days). These reminders also appear (automatically) on my Google Calendar. All good. However, when I receive a _notification_ of this reminder I only get the options to "edit" or "delete" (even when clicking through to the reminder in the Google _App_). I don't want to "delete" it, as I want to keep a note of reminders I've "done" and besides I have several "recurring" reminders" that cannot simply be _deleted_. And I certainly don't want to edit it. I want to simply "Mark as Done", but how? The only way to "Mark as Done" that I can see is to view the reminder in Google Calendar, when I get the single option to "Mark as Done". But going via "Google Calendar" requires additional (unnecessary) steps. Consequently, reminders often only get "Marked as Done" some days later then I see the entry is still showing in my Google Calendar. So, in there a better/quicker way to mark reminders as "done" - preferably from the "notification" - without having to go via Calendar?