The phrase "designated space" refers to an area that is specifically set aside or assigned for a particular purpose. It implies that it has been carefully planned or chosen for that particular use. Full definition
You can increase your points by landing on designated spaces for double or triple word or letter scores. (thespruce.com)
When their cart is full, they can pick a time slot for their pickup then park in designated spaces at their local store. (techcrunch.com)
Clear this one with a supervisor or boss first, and then designate space on your desk or file cabinet for your display rack and receipt book. (author-network.com)