I just installed Lubuntu 20.04LTS and am overall super liking it. One annoying feature is that if a window or application has an alert it will cause whatever virtual desktop I'm working in to be dropped and switch immediately to that desktop -- which is annoying at best, but could be quite catastrophic if I'm sharing my screen on a Zoom call and suddenly it switches to a private email message that others shouldn't see. It is mainly doing this with Thunderbird, when an email fails to send. But if that behavior is system-wide, I'd like to choose a different way of being alerted.
How can I have it just wait until I happen to go to that desktop and see the alert? (As every other version of Linux I've ever tried has done?)