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
I always unlock developer settings on a new phone to fix my Bluetooth volume. Android assumes Bluetooth devices have adjustable audio, so if they don’t it sets the default to max. Then you basically have two settings: “kinda quiet” and “I’m slowly losing my hearing”. Disabling absolute volume makes it so your phone only registers your phone’s volume buttons.