Just open up the actual Smart Scan - Check the Menu > Settings > Protection > Smart Scan and change the date and time to ‘Monthly 1st, 1am’ changing what is currently there.

Or if you want to run the Smart Scan you created using the ‘Create A New Scan,’ just leave that alone.
Set the actual specific smart scan to manual.
Check the Menu > Settings > Protection > Smart Scan and set to Manual.