Read-only Mode

If you don't want your students to make any edits on any tabs, turn on Read-Only mode, this way it's only you who can make changes in the Space.

Read-Only Mode for the entire Space

To turn on Read-Only Mode, click the Leader (Crown) icon in the top toolbar and toggle Read-Only Mode on.

Disallow student editing (i.e. Read-Only mode for specific students) 

Disable Editing per student, to stop individual students to have edit access in the Space. This is quite handy to manage disruptive students or allow edit access to one student at a time. 

To disable individual student editing, click the People menu then select a student, then select Disable Editing.

For more student management tools, refer to this guide.