1. Click on Setting in the menu

2. Select System Settings from the drop down menu

3. Click on Upload from the popup

4. Select the checkbox 'Use Automatic Days Days Reduce Setting'

5. Click on Show & Save Settings

6. In Popup you can change Start Time & End Time, set Time Interval, select Effect

7. Click on Save & then Ok

Note: In Automatic Day Reduce, Manual Day Reduce Setting i.e. F12 shortcut will be disabled.