The various Views on the GEDCOM data can be arranged in multiple ways – just as you need it.
There may be multiple panes of adjustable size. In each of them there may be several views as tabs. The panes can be docked or undocked. An undocked window (floating window) can be resized and floats above all of the other windows.
Via menu 'View → Layout' you can select predefined arrangements or create own ones.
This flexibility is especially useful for small screens!
Docking: To dock again left-click on the tab header, drag until the tab becomes shaded and then drag it into the main window, move it around until it fits as you want and the drop it. Or just select in menu 'View ' → 'Layout' one of the predefined layouts.
GenJ will remember our arrangement for the next start.
see Context Menu