The Rate Multiplier to use for this Phase only shows when Independent Phase Rate is turned on. The Phase will have the same Rate Multiplier number as the Project if the Independent Phase Rate feature is not turned on.
To change the multiplier for this phase, click the multiplier field.
Here you can see the Bill Rate source and the multiplier for Cost Rate and Bill Rate. Enter a new multiplier value on the pop-up, then click save on the top.
Confirm if you want to apply this new multiplier to all Work Categories of this Phase or just the new Work Categories.
Click Done on the Phase Info Modal