Teachers DESPERATELY need the ability to lock students on a specific tab or app once opened.

Perhaps the biggest challenge teachers face in the modern classroom is off-task use of computers. Students have low ability to resist the urge to play games and/or access websites that aren't focused on the classroom task at hand.

The "Allow" function is not useful especially when students are assigned something that gives each student their own unique URL.

PLEASE add a way for teachers to LOCK students onto a specific tab once it is opened.