Set expand height half of the main layout

I need the slider to only expand maximum at 0.4% of the screen. The anchor feature doesn't work as i want because it still can be expanded higher. Set layout_height also not what i want since it will also set the height of the main layout. Putting the main layout behind of SlidingUpPanel also doesn't work because even when SlidingUpPanel collapsed the area for SlidingUpPanel is always blocking the touch of the main layout.

Is there any feature that capable for this? It would be nice if this library has easy feature to fix this problem