Hi, ExcelNewbie101
Thank you for using Microsoft products and posting them in the community.
In the conditional format settings, you can use in the number format settings;;; that does not show, the operation is as follows:
Select Conditional Format - Set the formula, enter:
=AND(ISBLANK(B7),ISBLANK(C7))
This indicates that the format is applied if the corresponding cells in columns B and C are empty.
Then inside Format choose Number - Custom - Enter ;;;, which means nothing is displayed.
I hope the above information can help you. Feel free to send a message if you need further help.
Best wishes
Aiden.C - MSFT |Microsoft Community Support Specialist