Enable Touch Screen Functionality and Bottom Toolbar in Xournal++

Enable touch screen functionality:

Navigate to "Edit->Preferences"

Uploaded Image (Thumbnail)

This will bring up a new menu. Navigate to the "Touchscreen" tab and select the check box under "Touch Drawing" (denoted in red).

Uploaded Image (Thumbnail)

 

Enable bottom toolbar:

Navigate to "View->Toolbars->Toolbar Bottom"

Uploaded Image (Thumbnail)