All panels are movable and re-sizable. When the edge of a pane is hovered, the pointer changes to the resize mark shown below and can then be resized by pressing and holding down the left mouse button before moving it in the desired direction.
On the right-hand side of the screen there are the Preview and the Properties windows. Both of them can be docked or moved. By clicking and dragging on the title of a panel it is possible to move the panel wherever is desired.