Some settings belong to the vendor, some to the hall
A kitchen can decide how its own receipts read. It cannot decide whether it charges the hall card fee. A settings system for a shared site has to know the difference — and let the owner lock the ones that are the hall's to set.
On a single-owner till, every setting is yours. On a shared site it is not that simple: some choices are a kitchen's own business, and some are the hall's, and a settings screen that treats them all the same either takes freedom the vendor should have or hands out control the owner should keep.
Two kinds of switch
How a kitchen's own dockets read, which of its own quick buttons show, how its own screen is laid out — those are the vendor's, and it should set them without asking. Whether a card fee is added, what that fee is, how tips are handled at the site level — those belong to the hall, because they are the same for everyone trading there and a customer should not meet a different answer at each counter.
Set once, centrally, and lockable
So the hall-level settings live in the back office as well as on the till, where the owner can set them for the whole site at once. And the ones that are genuinely the hall's to decide can be locked — set centrally and shown to the vendor as fixed, not as a switch they can quietly flip on a busy Saturday. A setting nobody can override is only safe if it is also visible: the vendor sees what it is and who set it.
The rule that keeps it honest: a setting is not "advanced" or "basic", it is someone's to decide. Work out whose before you decide where it lives and whether it locks.