How do I delete or hide the ability for users to make reservations on 15 minute increments and only allow for 30 min increments when booking? Thank you.

Generally you aren’t able to limit users to 30 minute increments only. You can limit minimum and maximum length or reservations. For example you can limit a user to minimum of 1 hour and max of 2 hours. But within that range they could reserved for 1 hr, 1:15, 1:30, 1:45, or 2 hrs. You can also use the Block rule type to create EXACT time blocks that users must reserve. For example 9:00 AM – 10:30 AM, 10:30 AM – 12:00 PM, etc.