The Model menu is active in the Model-Editor and the Mechanism-Editor.
The Model menu is a sub-menu of the Mechanism menu, which is a sub-menu of the Add menu - see image.
The Model elements toolbar is to the left of the graphic-area:
In the Model-Editor, Solid elements flash red [default colour] as you move your mouse over them.
To stop this happening, use a filter:
|•||Use Selection Filter toolbar > Filter Points [for example]|