Hi Nuri, welcome to planDisney!
You chose such a great time to visit the
Disneyland Resort! So many beloved experiences have begun to return! For starters, the traditional character meet and greets are back in full force! This means Mickey and all his Pals are giving out the biggest hugs and signing autograph books again! Next, you have the amazing nighttime experiences returning! The Main Street Electrical Parade and Disneyland Forever fireworks at Disneyland Park, and World of Color at Disney California Adventure Park have all returned! And one of my personal favorites, Fantasmic! is set to return on May 28, 2022. Looking at your arrival date, you'll be able to experience them all! Exciting right?
But back to your main question. It seems like you've purchased a standard one park per day ticket. You can absolutely exit and reenter the parks at your convenience, but please note that reentry is subject to theme park capacity. If a theme park has reached max capacity, reentry may be temporarily disabled until capacity reduces. But not to worry, in all of my many visits, I've only seen Disneyland Park reach max capacity once, and after about an hour, reentry opened up again and I was able to reenter!
Hopefully, that helps, but if you have any more questions, please visit us again!
See ya real soon!
Jin