Remove Rate from Benefit Plan for 2021

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Hi,

Currently our Medical Waive plan has a credit associated with it.  As of 1/1/21 the credit goes away. 

Question 1.  I thought if I end dated the rate as of 01-01-2021 the rate would "disappear".  I reprocessed Open Enrollment for myself but the rate is still showing.  Is there another step I missed (perhaps something on the Benefit Program) or should I have ended the rate as of 12/31/20.  If that is the case does anyone know how to correct an end date?  I attached a screen shot of the variable rate I am trying to update.

Question 2.  There is a fast formula associated with the rate.  I think I need to remove it, but when I try the field does not open.  Do I need to delete the extra Inputs in the Additional Information Section first?