I found the below sign in a tweet about the new ordering system at Saizeriya. What puzzled me is the text on the sign at the bottom-left:
Please wait in line by ???ing at the chair to the right.
Ignoring the poor English translation, what is the intended meaning of ずれる? Looking it up in a monolingual dictionary, I only see the meanings I know, which refer to being displaced from an intended position (with nuances of being wrongly in that new position).
What, then, does the sign mean by イスにずれて?