Changing the size of Toolbar icons in v0.7.2
 

I know this is a real shot in the dark, given how old my version is, but does anyone know how to increase the size of the icons in the toolbar?

That feature to adjust icon sizes was added long after Sigil-0.7.2. You would be much better off upgrading to a new version of Sigil (1.4.3 currently ) or at least to Sigil-0.9.14 which is the last version to have BookView. Both of these have a slider to adjust icon sizes in Preferences I believe.

Thanks. I'll take a look at 0.9.14. My workflow is so tuned to 0.7.2 functionalities that I just grew very cautious about upgrading. Old dog (or dumb dog) and new tricks...

If you are going to upgrade, why not go to 1.4.3?

Because they want/need Book View. We've strived to let people know that they're free to use whatever version of Sigil works best for them since removing it. If they can't live without Book View, then 0.9.14 is the newest version they should upgrade to. We're not going to pressure anyone to upgrade past what they're comfortable with, and neither should you. Let people make their own decisions.