How to restrict user experience in Linux in a desktop environment?

Question

linux

It is necessary to make it so that the user can run only three utilities in the desktop environment.
So that there is no access to the console and other things, only the launch of three utilities through the desktop.
I tried to implement it through rbash and using symbolic link methods to allowed utilities, it didn’t work, dropbox doesn’t roll because there are a lot of holes in it for the customer, it just doesn’t work out with rights restrictions either.