In the Inspector Text Style panel, the buttons “BI U S” are Right Justified, so vanish off the screen if you make the Inspector narrow. Presumably, they should be Left Justified so they remain mostly visible.
Are you using an atypical font size in your Windows setup (or maybe a high-res DPI monitor)? I’m wondering how you’re even getting to the point where these buttons are collapsed out of view, as for how I have things set up it’s impossible to narrow the inspector beyond this point:
Many thanks! I’ll have to take a look at this with a few different configurations, as initial testing (in light and dark mode) still could not reproduce it. It might need a high-res monitor, which I don’t have, but we do collectively. At any rate, this is hopefully enough for someone else to see it.