This font size control was discovered while typing on the forum. All of a sudden the text shrank.
A web page font may be increased or decreased, in Windows, by typing Ctrl+, Ctrl-, or Ctrl 0.
For Mac, substitute Command key for Ctrl key.
Link: https://www.computerhope.com/tips/tip159.htm

- Brian

(I suppose a 4k monitor helps...)
Chrome seems to remember the shrinkage for a particular website.