Android 7.1.1 doesn't seem to have a font size change capability on my Samsung tablet. Any ideas?

You should have it if you...

1. Go to "Settings" and then "Font Style".
2. In there you should find "Font Size".

While it won't have a size number, it should have small, medium, large and perhaps another.
Aug 21, 2018

You can go to your play store and download an app called BIG FONT. it lets you make the font much bigger or smaller if you want. I've used it on an LG phone and a QYYO phablet, it does the job very well.