Mark the option to inactivate every feature in Connect Education Edge Setup form.

On the User Records tab mark sync Changes to Inactive and Update Core usernames to No.

User Records Tab

On the Departments, Courses and Rosters tab mark Sync Changes to Inactive, Sync Department updates to No and Sync Course Updates to No.

Departments, Courses and Rosters tab

On the Attendance tab mark Sync Changes to No.
 Attendance records tab

On the Marking Period Grades tab mark Sync Changes to No.

Marking Period grades tab

Save and Close the form