Using excessively small font sizes can make it difficult for your readers to consume your content and is less accessible to individuals with visual impairments. See More Information on the WCAG Guideline: 1.4.4 Resize Text.
The Font Size Is Smaller Than 9 Points
For Microsoft 365 users, highlight the segment that has the small-font-size issue.
Change the font size in the menu that is shown on top of the highlighted text, or go to Home > Font, from the navigation bar.