Steps to hide Workspace toolbars in Model
Warning! Recommend only using this in Model. Using this in Workspace is not recommended!
From Model
1.) Uncheck Display Toolbars
2.) Select titlebar
3.) Check Display Toolbars
If you Uncheck Display Toolbars in the Workspace view, toolbars will hide when you select any other titlebars and show when selecting the 3D view
Then if you Check Display Toolbars, the toolbars are hidden and they will not show! Bug

You can fix this by switching to Model and back to Workspace, or you can type
WindowsManager.DisplayAllToolbars = true
in the Command Console and press the Enter keyboard key