I tend to use the panes more for editing my layout graphics but I realized that some of these settings are, in fact, on the ribbon, but grayed out. Looks like there's even a gallery for setting the border & background, which I might like to add presets to. Is there something I need to enable to activate this, or am I misunderstanding what the Symbol group is for? It lights up for things like legends (technically a different tab), but not text boxes or other layout graphics.

I just added this text box, have it selected, and it's grayed out. Same for straight text.