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Yes, the default Microsoft Office font has changed from Calibri to Aptos.

Microsoft 365 office suite users on TikTok are picking up on the switch to Aptos that was announced and started rolling out last fall:

This new look specifies an updated standard color palette and type font that are applied throughout Microsoft Office. The new theme will affect only your document, not the look and feel of Microsoft 365. 

If it’s bugging you, this support page can explain how to change the default font or theme across Word, Excel, PowerPoint, and Outlook.