The order is effective at 5 p.m. Monday.
The announcement comes after Maryland Gov. Larry Hogan's recommendation Thursday morning.
Campuses should remain open, he said.
Drive-thru and food delivery services will continue to operate, he said.
One delegate proposed to call it "Olivia's Law."
Lawmakers heard arguments for and against the bill on Tuesday.
Mike Miller is set to be succeeded by a Democrat four decades his junior.
“I don’t see any other way to get the facts,” he said.
Among other objectives, the five people will build a comprehensive timeline of the school's response and provide recommendations.
It's been investigating the school in the fallout from Jordan McNair's death.