MacOS user has severe issue with Asian fonts

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Occasional Visitor

For some reason sometimes when crafting emails, Word docs or adding calendar events the fonts default to Asian fonts and a very small font size.

The top screenshot is what my Format > Font looks like in Outlook and the bottom one is from the user having issues:

Screen Shot 2020-02-11 at 7.34.03 AM.jpgKS-OL-Font-As.jpg