The starting point "Dynamic" continuously imports profiles that have the configured field properties. Multiple passes are not allowed at this starting point. Each profile can therefore only run through this campaign once.
Under Settings, you must first select a "Pool", then select a single or multiple selection field to be checked under "Pool Field" and finally the "Field Value" that the selected single or multiple selection should have. All profiles that have this value will be imported at the start of the campaign. If the campaign is activated, further profiles are imported as soon as their "Pool Field" contains the selected "Field Value".