Perspective best view to use for subviews

I have a view (see photo), right now just coordinate To attempt to make this more mobile friendly and for lower resolution desktops, what’s the best view container type to use and the containers within that container to achieve the best results? I thought flex, but before I spent too much time I wanted to get some advice.

Edit, there are also buttons in the 3 areas with the tables and a text box and dropdown in the tree area.