How could I forget? The schedule text style is controlled in the PROJECT (.rvt) and more specifically in the view properties of the individual schedule. Right click in the schedule view and choose ‘view properties’ then ‘appearance’. You can select the fonts, sizes etc. You’ll see the changes only when the schedule is dropped onto a sheet. (The font’s etc will not show in the schedule view only on a sheet.)
Titleblocks are a FAMILY. The text inside of a family is controlled within that family. Its styles do not automatically get imported into the project.