I'm not a PS gamer (Xbox here) but I believe the info you're looking for is from the 2nd free update which should be in here:
Hello Park Managers... Or should we say Campers? Prepare your parks and get ready to meet some exciting dinosaurs, from a frightening hybrid to several faces you may be familiar with. Buckle up, in this post we'll talk about our new additions as well as a free update! Say hello to the Camp...
forums.frontier.co.uk
But in case you don't have time to read the whole thing (which I recommend doing anyway) this is what I can see from the notes...
Sandbox Changes
There are several major changes and new features coming to Sandbox Mode. The biggest is that all dinosaurs, skins and patterns will be available by default when starting a new Sandbox level, regardless of whether or not they have already been unlocked. This does not apply to the cosmetic awards you get in Challenge Mode, but everything else is unlocked by default. All buildings and upgrades will also be available by default when starting a Sandbox level. Please be aware that we are not getting rid of era specific buildings, but simply removing the unlock requirement to have them available in Sandbox Mode. If you want to start building a park or facility right away, with everything at your fingertips, you can do that after Update 2 drops.
Another new feature coming to Sandbox Mode is the option to play with Research and Expeditions mechanics. This means that you can start completely from scratch and work your way up in any and all Sandbox maps in Jurassic World Evolution 2. Expeditions and Research can also be toggled on/off on the fly as you play, with no need to start a new park. Turning these off will instantly unlock all research and dinosaurs, and turning them back on again will set your Research and Expedition progress back to where it was.
In case you didn't know, this update has been out for a while since the 8th of March.