Last Tested: Aug 28, 2019
This is a workaround to enabling font size from the UI by creating a single value visualization out of a scatterplot.
If you use a scatterplot visualization and do one of the following to return a single row in the results set,
From here you can hide the point by changing the color of the point to white. You can do this by clicking on the color in Series > Customizations, and setting the hex code to #FFFFFF. Next you can change the color and font size to your desired style in Settings > Values (you'll need to set the color in order to see anything, since you've already turned it white).
And there you have it, a font-size editable single value visualization with a very limited use-case.
This content is subject to limited support.