Auto hold?

Go here and get the owners manual -
https://www.kiatechinfo.com/ext_If/kma_owner_portal/content_pop.aspx
Read through it because there are a ton of things on that car that were not on your old one. Some of which can be messed up simply by putting a sticker on the car in the wrong place!
And here to get the features guide -
https://www.kiatechinfo.com/ext_If/kma_owner_portal/content_pop.aspx

The basics are that your car has electronic parking brakes, no cables. The auto-hold uses them to apply the brakes whenever the car is running but stationary. So, like you come up to a traffic light and stop. In most cars you would set there with your foot on the brake. With auto-hold on, you don't need to hold the brake, the car will just set there. BUT it does not turn on the brake lights when you release the pedal. So, in the old car those lights told someone behind you "HEY that car is stopped" and they would slow down. With the auto-hold there are no lights, so to me that "feature" is not all that safe. The switch is probably not a real switch but a capacitance switch like the ones used on touch screens, just a light touch makes it work.

Yeah they timed out the link, sorry, Try this one:
https://owners.kia.com/content/owners/en/manuals.html

It is selectable. If it is on the light on the switch will be on. But your car also has the electronic park brakes and those also can activate on their own.

Could be the brakes burning off the shipping coating. Go for a drive, get to a spot where you can stop and get out. Now lightly step on the brakes and let them drag and then stop and get out and smell around the car. Do you smell it? If yes, it's likely the stuff they spray on the cars for shipping. Keeps the critters away and prevents the moisture in the air from corroding the car parts that are bare iron, like the brake rotors and calipers. Braking causes heat and that will "burn" off the coating. Should go away within a few hundred miles. It's pretty much an oil spray like they use on new brake parts. Some use a soy-based oil and it can smell like popcorn or burnt fries. Means you got a real new car and not one that they were running around as a shop car because it wasn't selling. Take it out for a nice long drive where you can vary your speeds and braking. Don't race it and don't brake abruptly. Try to be smooth. That will let the engine get broken in and the various parts to break in evenly. It's part of the vehicle break in process. They pretty much put the car together, start it, drive it out of the plant into the holding lot. It sets there until they load it onto a train or truck carrier for transport to the dealer. Then it sets on the lot for a bit. The coatings keep the rust at bay. Then they bake off as they heat up. Just another of the "new car smells" these days. At least they don't use some of the coatings they used to use, those had the lovely smell of hot tar that hung around for a while.

That is why they tell you to avoid both of those during the first 1,000 miles or so. The idea is to gently break in the parts of the car, so you have a longer service life. Hers would likely smell the same if it was driven that way. As it isn't being driven that way it will likely not heat up the brakes. Those are not things that are good for the vehicle, especially ones that have all the modern ADAS features like those do. Read through the manual about them. The smells should go away as the coatings bake off from the heat.