When you park at one of the Disneyland Resort parking structures/lots, you can certainly leave and return throughout the day and only pay once. Simply keep your parking receipt ticket so you can show it to the lot attendant when you return later in the day.

Yes, you are permitted to leave the Disneyland Resort parking lots and return later on the same day without paying for parking a second time. When you first enter the Mickey & Friends, Pixar Pals, or Toy Story parking areas, you will receive a paper or digital receipt. To re-enter, you simply present this valid receipt to the cast member at the toll booth. This is particularly useful for guests who wish to take a midday break at an off-site hotel or grab a meal outside the resort. However, re-entry is subject to parking availability; if the lots reach full capacity while you are away, you may be redirected to an alternative lot or have to wait until space opens up. It is important to note that your parking pass is valid for the entire day across all official Disneyland Resort parking locations, so you could technically move from the structure to the Toy Story lot if needed, provided you keep your original receipt as proof of payment.