I have a 2021 Toyota Land Cruiser with 1900mi. Makes a little quick when I decelerate but it's not the brakes. The mirrors fold in when I start the car. Also when I leave the car it's beeps for like 10 seconds. What should I do?
it looks like you left out a word or something
"Makes a little quick when I decelerate"
Squeak?
Those problems seem like software settings you just need to adjust to your preference. The dealer can show you how, or the owners manual will also have that information.
As for a sound on deceleration, I would also ask the dealer and see what they say.
I would read the owner's manual about the mirrors and beeping. There could be some feature you're not aware of.
If you can't figure out then take it to Toyota. I'm sure they'll be happy to explain it to you, or fix anything that needs it under warranty.
Reading the owner's manual as suggested is a good idea, but if it's like most of them these days that thing is like an encyclopedia. (One friend with a late model car found that the section on operating the radio is nearly 200 pages long!)
Pointers from the dealer will probably be faster and easier if you can find someone there who actually knows the product, which can be something of a challenge. A lot of sales people have little knowledge, they might as well be selling washing machines. Service department will probably have more knowledgeable people.
As an aside, you know you're old if when you see "Land Cruiser" mentioned on an automotive site this is what automatically is pictured in your mind's eye:

damn that's a nice car
Wow thats ugly like a rocket ship with a long nose the curved facia ugg. I'd prefer the Fiat Multipla for style
haha I guess so. Not as beautiful as the Multipla, but hey still a nice nuclear weapon statue.
@mountainmanjoe, Kids today, what are you gonna do... That's a 1950 Studebaker Land Cruiser and the nose is indeed designed to be reminiscent of WWII aircraft. (The war had ended just a few years before the car was designed.) My grandfather had one and my earliest automotive memories are of that car.
if I ever got a vintage car for sunday driving, it would be something like that, or and Olds, or Ford Deluxe.
Even though it's on the Tundra, they have the 5.7 V8 just like the Landcruiser, so this video might be helpful explaining the squeak. He starts to talk about it at 2:56 mark.
https://www.youtube.com/watch?v=l2OAHImTgA8&t=1s
Also when I leave the car it's beeps for like 10 seconds. What should I do?
We had this issue with our 2017 RX350. We had the beeping when getting out of the car. My wife noticed that that one side of the back seats was not fully up and locked in place. You hold a button down to lower them and to lock them back up in place. After my wife locked the seat up fully, the beeping went away. At least I assume this fixed it because the beeping went away. I don't know if this is your problem but I would check it.

