I don't know who needs to hear this but please please please please please explore the settings. Of your phone, computer, of every app you use. Investigate the UI, toggle some things around and see what happens. You won't break anything irreperably without a confirmation box asking you if you really mean to do that thing. And you can just look up what a setting will do before touching it if you're really worried ok?
Worst case scenario you just have to change the settings back if you don't like what happened but it is so so so important to explore the tools available to you and gain a better understanding for how the stuff you use works.
Even if you already know. Even if you're comfortable with how you use it now. You don't just have to accept whtever experience has been handed to you by default and it's good for you to at least know what's available to you.