I’d like to modify a style from selected text that I modified manually. The Guide says to click on the arrow beside the NSfS icon. Maybe I’m dense, but I don’t see such an icon. And the only things with arrows are the style, font, and size boxes. Can you help me find it? Eg, where is it, or what does it look like, or ?? Thanks!
Hit F11, or from menu bar
Formt > Styles and Formatting > ✓, to open up the Style Panel. Then use the right-most icon at the top of the sidebar:
(Click image for full size) That should do it.