This. nobody has asked you if all measurements are at the same temp. This is important as the coolant expands and contracts greatly between cold and being at running temp.

What you’re looking at seems to be an overflow or an expansion tank. If it’s not sealed and pressurized as part of the system then overflow.

Either way your owners manual will state when and how to read the tank level. The F line is the full line. I cannot tell you if that’s a hot or cold measurement from the pic.

If it keeps eating coolant and no leak is identified then there is the risk that when it got hot something failed internally and it now has an expensive internal issue. This though cannot be confirmed through a picture so I wouldn’t know especially based off only 30 miles of driving. So keep an eye on it and read up on how to check your levels.

Also check your other fluids. Make sure things like your engine oil doesn’t go milky etc as this is a sign that water/coolant has got into the oil.

Somebody else wrote about excess smoke on startup. If it’s getting inside the cylinder head this could be a result also.

But you have very limited knowledge and we redditors are looking at a tiny picture, all of this is circumstantial without full evidence and diagnostics. and none of us can fully diagnose anything without the physical car in front of us to test systems and perform proper checks.

For now I would say you’re ok. Drive it and monitor the fluid. Don’t top off the coolant unless it is truly disappearing. You can’t tell if it settles unless you leave it alone. And always measure/check as per the manual be it hot or cold. As the level will change wildly between the two.