It’s important to keep your model in sync with the reality it reflects! But in a large model, some things might be a lot of work to change. Then you’ll have a degrading model – not good!
You might not know, but the model in MDriven is itself a MDriven model.
In most places, in the designer, you can right-click and select Extras and then “Show autoform…” or “Open Model Debugger…”
You will get exactly the same dialog as you would in your own model, but with the model’s terms.
So, in the Model Debugger, you can run any OCL against your model to find what you’re looking for, and then manually alter any and everything.