Purchase limits (aka allotments) are used to determine and enforce the maximum amount of each product category or combination of categories a customer can purchase.
Dispense hardcodes these limits on the backend per state for both in-state and out-of-state customers, and both Med and Rec customers - or combination of both, if applicable.
This is on by default, there is no setting required.
Dispense only limits this per-purchase, some states have daily limits, monthly limits, or other custom limits (e.g. 90 days). You should ensure your dispensary is in compliance with these rules.