Under the configuration menu, go to Call Forwarding. Once you slide it to on, you will see an option for Call Forward Selective. You can add a schedule to when and where you want calls to be forwarded. 

You should submit a TAC ticket to get your issue resolved

The receptionist client is being retired. The announcement was made in December 2023. It has been replaced by a new modern experience, The attendant console https://help.webex.com/en-us/article/4xgekbb/Get-started-with-the-Attendant-Console

James, this is not normal as you should be able to see those settings. Please contact TAC so they can resolve your issue.