1. Navigate to 'Server' > 'PubSub' > 'Node Summary'

2. Click the edit icon by a node

3. Untick 'Persist items to storage'

4. Edit 'Max number of items to persist'

5. Click 'Update'

Outcome: 'Max number of items to persist' value resets to previous value

Expected: User is unable to edit 'Max number of items to persist' when 'Persist items to storage' is not selected.