"Welcome" sound and screen dimming

Apologies if someone has already asked these questions. I'm new to the forum and haven't yet learned how to search effectively.

I recently (Thursday) got an 18 Prime Advanced, my theory being that my 07 Prius, with 248K on it, is probably living on borrowed time although it still runs wonderfully. I have two questions. (1) The large screen (11"+) is undesirably bright at night. Is there a way of dimming it that I've just not discovered yet? The manual may tell me somewhere, but I've read through the entire thing and don't recall seeing it, and the index has nothing about it.

(2) When one turns the engine on or off, the car plays what I'm sure Toyota conceives of as a "welcome sound." If it has any function other than noise, I can't figure it out. I would love to disable it. Is there a way to do that? The sound strikes me as very Microsoft-ian: it has no operational function. The question is whether Toyota has emulated Microsoft to such a degree that the user cannot disable the feature. (Disclosure: I am not exactly a fan of Microsoft. I run Linux with a Windows VM only because my University uses Microsoft Exchange, which has no good Linux client.)

Thanks in advance for the help.

"Keep smiling; it makes people think you're up to something."

 

Ah, but you were enormously helpful. I found the settings I needed. Apparently all that was necessary was your encouragement. Thanks for taking the time to reply; I really appreciate it.

 

I should amplify so others don't have to search. (I'm a bit slow on the uptake.) Go to Menu\Settings\General and scroll down to Start/Stop Sound. You can toggle it to "off."