Development and Application Modes
The Diagram window (and child Diagram windows) operate in two modes. When the toolbar is visible, the Diagram window is in development mode. The toolbar can be made visible or hidden using the Show/Hide Diagram Tool Bar command, entering Ctrl-D or by clicking on the Diagram Window speed button. 
Starting with version 11.106, clicking the D button at the upper right of the Diagram window will change to Development mode when EES is configured to show separate windows. The button caption will then change to A. Click the A button to return to Application mode.
In the development mode, all objects such as text, graphic objects generated in EES (lines/arrows, rectangles, ellipses) or in an external program, links, buttons, and hot areas can be copied, moved, resized, modified, or deleted. Right-clicking on a text or graphic object brings up a popup menu. The Properties item in this menu allows the characteristics of the selected item to be modified. Input variables are disabled in development mode and calculations initiated with the Calculate button are suppressed. Hidden objects are visible in development mode. A status bar is visible at the bottom of the Diagram window in development mode. The status bar shows the cursor position, Diagram window identity and information about the object that the cursor is positioned on.
When the toolbar is hidden, the Diagram window is in application mode. In application mode, it is not possible to move any of the objects or change their display characteristics. Input variables are enabled and calculations can be initiated using the optional calculate button or the commands in the Calculate menu.