Previously asked and answered in older versions. No solution for Outlook OWA in 2020. Older instructions don't apply now.
See Prevent Outlook from automatically deleting meeting emails
Most recent comment to above discussion is copied below, but there's no response to it. Also, can't find anything else anywhere on Internet.
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So that I don't ask the exact same question again, is there a way to update this? Outlook356 on the web has completely different settings in 2020. What's the proper Stack Exchange protocol for extremely old questions and the hot mess of Versions that makes of MS Office? – Chazbot Feb 19 at 2:27