You can set the booking form to open as a pop-up, a new window, or to go through the booking process inline within the widget (as long as the widget is large enough).
From the Dashboard, click the Cog/Settings icon.
Click Dept Settings.
Use the Booking Form Type dropdown menu to select the desired setting.
Please note that if you have also selected to skip the widget slide menu then this will override any selection of the Booking form type and will open the booking form inline.