Have you ever needed to work with a small group and have the rest of the class continue in GMM with replacements allowed? Do you have an activity period or homeroom where students are working in another classroom and they need to have replacement problems available?

By default students have replacements while you are online.

To find the setting:
Choose CLASSES from the blue ribbon.
Choose a class from the left column.
Choose Settings from the middle gray column.
Move the slider to green to allow replacements while the teacher is online.