Then no need to change right now.
If the coolant has never been replaced on a 2018 model I’d expect to see a little loss of coolant, possibly as much as a cup or two. Where does it go? The water pump’s dynamic seal isn’t 100% perfect. And if there’s any small vent holes in the reservoir system, some coolant will evaporate there. Both my Corolla and truck have a vented reservoir system, but some cars don’t.
Actual coolant leaks of course aren’t uncommon at all. Where sensors plug into the coolant jacket are a common leak location. The hoses in modern cars are pretty robust, last for years and year, but the hose connections can still leak, most common when the connection is removed then replaced for some reason, for example making better access to do another task.
As suggested above, topping off, then monitoring the coolant level over the course of a few months is what to do. What I do is mark the coolant level on the plastic bottle with a sharpie (black felt pen) before I start the engine first thing in the morning, then a higher mark when the engine has reached normal operating temperature.
If you discover the coolant really is going lower at a rate more than an ounce or two a month, and no obvious external leaks, first place to look is the water pump weep hole. Google will explain what that is.
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Well they aren’t going to have a professional mechanic at 80+k a year, pour a cup of coolant in. But in accord with Bruce Williams business and customer satisfaction principles, I don’t know why they just didn’t have their lot kid put a couple cups of coolant in and end the whole thing? “There you go miss brown, all set,no problem but we will check it again in a year to make sure.” It’s really so simple.
Instead the got the guy going from dealer to dealer and returning for something that would take two minutes and 25 cents.
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By professional I meant someone who works on cars rather than doing it myself. And I totally agree with you. Why didn’t they just top it up instead of telling me everything is good.
I also understand many of these tasks are simple to perform. It is a challenge for me to add wiper fluid. This should explain the seriousness of my medical condition as to why I don’t work on cars. 
I am surprised that neither dealership offered to just top it off a bit. Or even “If you buy a gallon, I’ll get a tech to add some” kind of thing.
that’s not very good customer service. If you aren’t comfortable adding this yourself, find an independent shop near you and ask them to top it off- and nothing more. Then keep an eye on it yourself. Check it each week, same time, and always before you start the car for the day- and see if it lowers any. I’m thinking it will be fine.
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The driveway attendants can’t perform these tasks.
When that cap is removed from a car that has had 30 minutes to cool, the level in the reservoir rises a few inches as the pressure is released, then how much do you add? If the cap is removed while the engine is hot, the person could be burned by hot coolant.
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There you go. This is why I prefer a professional to do these things. I certainly would hurt myself performing car works. 
Sorry but I think you are making this a bigger deal than it really is. either leave it alone and keep an eye on it or add a cup or so of coolant. with such a little amount needed just add a little of bottled water. if you can lift the hood to check the level, then you can open the cap and add some when the engine is cooled. you won’t hurt anything. just make sure you tighten the cap., and you are done.
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I went back to Toyota just a moment ago as it much closer to home. And I told them what you guys said here ( that I could always top up the coolant ) and they agreed.
However, I’m a bit paranoid. Doesn’t it look like they added way too much coolant ?
Wait until the engine cools and check the level. A little extra won’t hurt anything, there is plenty of expansion room in that tank.
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Looks fine, check it cold. Plenty of room. It’s not that critical.
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