Hi, cramoswalton
Thank you for using Microsoft products and posting them to the community.
The Online version has some limitations in directly clearing the contents of unlocked cells in batches, but you can directly select the unlocked area and then press the Delete key on the keyboard to clear it. This is also the most convenient solution at present. Are you unable to delete because you selected all?
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