Here are Preferences dialog settings available in the Company category, on the QuickBooks Connection page.
Quick Reconnect (button)
This reconnects the currently-open ManagePLUS company file with whatever company is currently open in QuickBooks. This is useful when, for example, you have changed the company name in your QuickBooks file and need to make ManagePLUS recognize it as being associated with the current ManagePLUS file.
Full Connection Setup (button)
This button invokes the ManagePLUS Connection Wizard to let you change the QuickBooks company associated with the current ManagePLUS company. You might use this when you’ve moved and/or renamed the QuickBooks company associated with the currently open ManagePLUS company file.