You can close any of the toolbars you don't want to see in Didger 4 by going to View | Toolbars/Managers or by right-clicking over the toolbars. If there's a check mark next to their name, then they are open/viewable. When there is no check mark, those managers/toolbars are closed. Just click on their name to toggle the check mark.
Updated October 12, 2016