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.
Model menu, from Mechanism menu, from Add menu
The Model elements toolbar is to the left of the graphic-area:
In the Model-Editor, Solids elements become red [Change colour to Red if it is now with Application Settings > Graphics tab ] element selection colour] as you move your mouse over them.
If you only want to view, spin and pan the model:
|•||Use Selection Filter toolbar > Filter Points.|
Now: the Solids will not become red , becasue there are not any Point elements in the Model-Editor.