You can view the masses a minister prefers to serve and which masses are the least preferred. On the Information tab, click Ministers > Mass Preferences.
Use the Preferred Masses grid to track the masses a minister wants to serve for each ministry role.
In the second column, you can add a different mass that the minister can be assigned to if the preferred mass is not available. When scheduling, if the preferred mass is already assigned to another minister, this minister will be considered for the mass you enter for this ministry.
If the minister is assigned to their preferred mass, they're also assigned to the second mass if it's available (as long as the minister's Max Assigns Per Week is at least 2).
Least Preferred Masses
Use the Least Preferred Masses grid to keep track of a minister's least preferred masses for each ministry.