Can I freeze the top menu bar (the project, task, customer, time card button bar) on the top?

There is no native way to Freeze titles, but that is by design so as to maximize screen space when you scroll down.

But you will note that QuickBase conveniently leaves a tiny "tab" in the centre top just below where the table bas used to be to zoom the user back to the top of the screen without needing to scroll at the way up again with the scroll wheel.