Excel and avast

I want to save the excel file, but the information is displayed, it is impossible to save changes due to violation of the rules of use and then it says that it may be a matter of antivirus settings, please help

It may be related to ransomware shield … if you have that?

https://support.avast.com/en-ww/article/Antivirus-Ransomware-Shield-FAQ/

https://support.avast.com/en-ww/article/Use-Antivirus-Ransomware-Shield/