I am Office365 Administrator in my organization and recently I received the same issue from 2 members.
Regardless the language is in trad-zh, when the 2 members create a meeting, all characters in 標題(L) = meeting title, is too small to be read. (circled in red)
I also checked my Outlook and mine looks totally normal but differs from the one we have issue, although we installed the same Office365 suite on our Windows 10. (circled in blue)
Could you please help us to check what happened and how we can fix it?
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OK I probably know what happened.
Those 2 members accidentally enabled "Coming Soon" feature, while I didn't enable it.
Now the issue is gone after switching back.