https://kbin.social/m/androiddev is more appropriate for this type of post.

Swap screen down from the top of the screen - like when you want to see a notification: different devices acts differently, in some you have to swap from upper-right to see the tiles. You can also edit the tiles to add, remove and re-arrange, in order to have the ones you use more often in the first page.

“Do not disturb” option should be available as a quick setting tile, which is more complicated to activate from a button combination, but not too hidden in the device settings.

For “Do not disturb” (if this is what you ask) you can configure it in device settings: Sound > Do Not Disturb > section “What can interrupt do not disturb”.

You have the obligation to use it since the manufactures doesn’t gives updates to various versions of the OS, for example, if the device has version 13 and there is an update for 14 if you choose to not get the newer version you’ll not get security updates for version 13. Also, newest devices will get only version 14 (or newer) and with the boot loader locked you can’t install a different version of the OS.

For me, the question is whether I have the right to use a device I bought as I want or not. There is, rightly, a lot of talk about “right to repair,” but now the issue is becoming “right to use”.
Can I install an old application that I still find useful or should be the operating system to decide if i can use it, without there being an incompatibility issue?
Can I decide what permissions I want to give an application or should the Play store (and protect) decide without appeal what I can do?

Both are allowed.

• Kotlin: “are you talking to me?”

This could be useful. I will add it in the to-do list.