When the view base is focused on a binder you can de-focus the view:
focus on previous binder with the toolbar button or using menu View / Zoom back on previous binder (Shift+Z keys). The binder that contains the current view base will be the new view base (and zoomed to fit the window area); if the current view base is contained directly by the window than the view will be not focused (normal view).
restore normal view with the toolbar button or menu View / Normal view (W key) to make the window the view base (as normal).