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Problem

You have upgraded from MES 2.0 to MES 3.0.

At this point, you must have found that the Production Model IS NOT visible in the Designer Project Browser anymore

As documented here Production Model Overview 
you can now only display it using the MES Component Equipment Manager

There is a possibility that upon loading an "old" MES 2.0 window with the  Equipment Manager, nothing will load and
the Production Model will not display

Solution

In Enterprise, the Equipment Manager is a Production (Module) component, not a OEE component anymore.

IF you are NOT using OEE => your "old" window will not load. You will need to create a new window and drag

a "new" Equipment Manager component in order to access Production Model information.

Production Model Overview