Select the model(s) to hide in the list.
Click 
in the toolbar.
Or
Select the View > Hide model(s) from overview menu option.
Or
Right-click the model and choose Model > Hide model(s) from overview.
When models are hidden, an indicator is added to the toolbar showing the number of hidden models.
To show the models, click 
in the toolbar.
Or
Select the View > Unhide models menu option.
Or
Right-click a selected model and choose Model > Unhide models.