How do you fill remaining viewport if there is a navbar?

I have an app that display components under navigation bar, so how can i set screen height to fill remaining viewport and display the app till navbar?

Use fill parent on your arrangement.

Show screenshot if that is not what you mean....

This is the situation: the home icon and users icon are under the navbar of Android. How can i display the app till the navbar?

Android version & device name?
And post the aia or a simple test aia that reproduces the problem.

fill parent

Ensure Screen1 Scrollable unticked/unset