CORDON

to form a protective or restrictive barrier

/a series of sentinels or of military posts enclosing or guarding some place or thing

"They needed to cordon off this part of the seating to reserve room for the baseball team that would be coming as soon as their game finished."

"The police had cordoned off a small area for the reporters to stand."

"He refused to cordon a special area for him just because he was rich."

"What was great about concerts was that there was no attempts to cordon off oneself from the rest of the crowd."