Navigate your phone settings and first go to about phone. From there go to software information. You should see your build number. Tap the build number several times in a row and developer options will be unlocked. This gives you access to developer options and a whole new set of customization features
You should also know that activating usb debugging in there is the best way to have a chance at fixing anything that goes wrong later. If your age screen shatters, there’s ways to access what’s on the device if you’ve solar already hooked it up to your pc and set it to always allow that pc to access the device. It can help with bootloops or other issues too.
It’s optional, but you’d be amazed how many times someone has needed that access.