All Android apps show a title bar unless the developer decided to remove it. Set #IncludeTitle to False if you want to remove it.
In the designer you can also remove the bar by setting the activity properties. This will only affect the visual designer. Note that it is not very useful to deal with the designer title as your layout should be flexible and work with all devices.
I recommend you start with the beginner's guide:
http://www.b4x.com/android/documentation.html it covers all of these issues.