"Position Preferences" can be set for each employee (similar to skills). When you use AutoFill, you can choose whether to consider these position preferences or not when the shifts are automatically assigned.
It can be helpful, for example, to indicate that an employee can work a difficult to fill position if needed but you prefer to have them work other positions. It can also be useful in setting which locations the employee prefers to work (Ex. for an employee you can set all Location 1 positions to "prefer" and other location positions to "dislike"). Managers (with permission to edit employees) can set these preferences - but you can also allow your employees to set their own position preferences on the SETTINGS>Global Employee Permissions page.
Employees do not see position preferences unless you have set "Employees Can Set Their Preferences for Positions" to Yes on your SETTINGS>Global Employee Permissions page. By choosing "Yes", you allow Employees to see and set their own preferences for locations or position preferences when they sign in.
When Employees sign in and look at their Preferences page, they will now see a list of their positions and will be able to set each position to prefer, dislike, or no preference.