This item toggles the display of the node symbols and node number. This effects both the display in the Main Window and Printing from the File Menu. The menu item changes from Hide nodes to Show nodes depending on which action is next.
This item brings up a dialog box in which you can set the snap spacing. This spacing, in model length scale units, is used to draw a grid on the Main Window and mouse clicks on the main window only give positions on the grid intersections. Enter a value of 0. to turn snap off.
This menu contains two items. Help simply gives you the URL of this documentation and About displays the current version number of the program.