How to suppress "Confirmation" pop-up on assignee-change?

In the workflow I'm working on, we have one workflow action ("Update"), which leads to a decision diamond.

That routes to the next step based on the value in the record status field.

For each of the next steps, the assignees are preassigned to groups and filtered by values in the record.

When we "Send" the record forward, it evaluates the assignees and shows a "Confirmation" dialog box which reads:

"The list of assignees will be changed to reflect the data entered on the form. Click Yes if you want the list of assignees to be updated. Click No if you do not want the list of assignees to be updated."