I had the same issue.
Pressing "E" got be past that screen.
Unfortunately, the control page shows a "W" for everything, s:
WASD (movement)
E (pick up/put down)
F (chop)
Also, the counter below you doesn't have any use, the blue thing is a bin to toss food. The customers appear on the right hand side of the screen, seated at tables. You need to manually check when the bell rings to see what food they want.
As far as I can tell, there is no way to feed anyone once they stand up.