Charge priority of AC and Solar

I have Victron Multiplus II and Victron MPPT. How do they work together charging the battery when both are connected? If they both charge the battery the load will be too much. Is it possible to program so that solar gets priorized over AC? Do you need somekind of device for that?

It should just be a setting. You decide what charge rate and order of priority.

Sorry dumb question but which device can you program, or both?

BTW here is a video explaining how multiple chargers work together, but it doesn't explain what is safe for one battery: