Can you show a screenshot of how Spine looks at your resolution?
You can move the tabbed views around by drag and dropping the tabs. You can resize a view by dragging the edge. This should enable you to configure the views to work at your resolution.
I could add hotkeys for zoom. The reason they are missing is that zoom is best done with the mouse wheel. Place the mouse cursor where you want to zoom in, then mouse wheel up. Zooming out works similarly, except place the mouse cursor where you want to see more of when you zoom out, then mouse wheel down. This should quickly become very natural and allow you to easily navigate your skeletons.