It's fairly simple to adjust the number of displays on your Parsec to match your physical monitor setup. Just follow these steps:

1. Click on the ^ menu at the bottom right of your display and then click on the Parsec icon.

2. From the Parsec Settings window that appears, choose the Gear icon on the left column and scroll down to the Virtual Displays setting and adjust as desired.

 3. Changes will only take effect when you restart. R-click on the Parsec icon in the bottom right and choose "Restart."