How to stop attachments on email report

Can you please clarify what you are doing, I am a bit confused on which functionality you are using.

When you mention forward the report to leadership how are you doing that? From inside Quicksight ?

In case is a schedule inside QuickSight have you checked if during the creation of the schedule the optional checkbox for the attachment was selected? https://docs.aws.amazon.com/quicksight/latest/user/sending-reports.html

Also, for QuickSight related questions we have launched a fully dedicated community; in case you want to check there to see if there are further answer to your questions.

hope this helps,