Hello KVJohns,
Sorry for the delay in response to your query and apologize for the inconvenience caused.
As per the description above, the Viewing Font in Acrobat is changed, and you are not able to change the settings back, Is that correct?
Please refer to the following link which discusses the similar issue how do I change the font size in adobe acrobat reader dc? https://forums.adobe.com/thread/1886410
You may also refer to Change default font for fallback in PDF editing and Add Text Link: https://helpx.adobe.com/acrobat/using/default-font-pdf-editing-add-text.html
If the issue still persists, please reset the preferences of Acrobat, to reset the preferences, refer to How to reset Acrobat Preference settings to default.
If possible, please share the following details:
- Is it Acrobat or free desktop version of Reader installed, check from Help>About Adobe.
- Is it a Mac or Windows machine?
Hope the above steps help , and keep us posted with the results.
Regards,
Anand Sri.