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An option to filter by number of values in a multiple-select or linked record field.
Easily locate records associated with multiple other records. In my specific situation, a collaborator is asking why certain Tasks are linked to two projects instead of just one. (A hacky solution is creating a field with the array joined values of the linked field and then filtering by which rows contain the value separator.)
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Users who are refining Base designs, such as cardinality, based on feedback from non-technical users