Hello, 455Shelly.
Welcome to Microsoft community.
I understand that It is really annoying that after you set the default font, Word still changes the font automatically. Please don't worry, I will do everything I can to help you.
I would like to confirm more specific information with you so that I can more accurately determine the problem you are encountering and better assist you:
- Could you please share with me the specific steps you took to set the default font and the specific version of your Word so that I can help you test it later?
- Check the products under your account: You can do the following: Open Word > "File" in the top left corner > "Account" in the bottom left corner> share the screenshot of the product information displayed on the right with me so that I can help you more specifically
Once I have obtained more information about the above, I will be able to provide you with more targeted assistance. Before replying, based on the issue you mentioned, it is recommended that you can try the following steps:
Ensure that there are no files in the following folders:
- Navigate to
C:\Users\YourUsername\AppData\Roaming\Microsoft\Excel\XLSTART Press Enter, and check if there are any files. If there are, cut and paste them to the desktop for backup. If not, close the window. (You may need to check "Hidden items" under View in File Explorer to see the AppData folder.)
- Navigate to
C:\Program Files\Microsoft Office\root\Office16\XLSTART or C:\Program Files(x86)\Microsoft Office\root\Office16\XLSTART, and check if there are any files. If there are, cut and paste them to the desktop for backup. If not, close the window.
Feel free to share updates with me on how things are progressing after you've completed the aforementioned steps. Should you have any questions or require clarification, do not hesitate to reach out to me. I‘d like to do my utmost to assist you.
Best Regards,
Hannah.Z- MSFT |Microsoft Community Support Specialist