How can I prevent screen sharing within a zoom meeting, and download of content shared by chats inside and outside of the meeting to the device?

The content shared at the meeting
can not be downloaded because the content is not the file itself but only the image sharing .

Also, if you do not want to download content via chat, you can not send or download files by turning off the file transfer function for the entire account .

How to turn off sending files across accounts

Set [ File transmission ] to OFF from account settings .

If you turn on the key mark to the right of the button, you can force all users in your account.

You can set My Meeting settings to ON / OFF of file transmission in personal settings