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 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.