You can change thickness at the machine if you add materials. but things don't generally go well when you do this since the reference face is always against the spoil-board. I've done it for one offs, or just used the thickness that was very close, for Jobs where the change is negligible. BUT it is a bad habit and can get you in trouble pretty quick if you don't fully understand the effects.
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Win 10 Pro 64 bit on MSI Z390M Pro4
Intel core i7 9700KF 3.6GHz (OC 4.2Ghz)
32 gig RAM, NVIDIA GeForce GTX 1050 Ti
NVME SSM2HD 1TB NTFS