Only admins can turn on approval for suggested edits
Click the Settings icon in the left navigation pane
Click into the General section
Toggle on of off Require approval for new suggested edits
Disabled (toggled off) - As soon as a redline is made, it will be included in the run.
Enabled (toggled on) - When a redline is made there will be a dot to indicate there is a change but the Accept Changes button needs to be clicked to include the changes in the actual run.