Description
Relation view switcher is not so easy to spot and switching views takes time.
Allow Pin Relation Views.
Pin action is available in … menu for a relation view
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When relation view is pinned, we add one more row with pinned views (similar to Pin Entity Views)
Pinned Views work as radio buttons
There could be case, where all tabs are unselected: user pinned some views, but selected another one, which is not pinned