The filter and sort is nice to have identical for everyone, but most of the time in my case I would want client-sided filter/sort, as in, the filtering/sorting is only visible to me.
Allow non-creators extend filters and have per-user filter for every view.
Introduce My Filter section in Filter.
When I open a filter, I see My Filter section in the popup and it works exactly like current filter.
My Filters are remembered → It means if a user refreshes the page, filters are still applied.
Highlight filters in the Filters menu with the visible dot (other thing?) to indicate that there are My Filters.
NOTE: My Filter only extends Global filter, so it is not possible to non-Creator to override filters, only extension is possible.