To adjust a recurring rate mod you can do it from job level or the home level.
Job Level
Double click open the job and choose 'Modify Rates
On the next modal choose the down arrow next to the recurring rate mod and either set an end date or delete the rate mod
Home Level
Go to the Home Profile of the account and choose the Rate Log tab
Scroll down to the Rate Modifications and perform the same as the Job Level by choosing the down arrow and setting an end date or deleting the rate mod.