Open ObjectDock properties...then click on "General" then "Advanced Options" and then you can change the font from there. I believe thats what your looking for.

I'm pretty sure you would change the font in the same way. The only other way is to click on "tab settings" and the click "adjust the font used for text on tabs." Not quite sure what your looking for other than that. Maybe someone will come along that gets what your after.

Hello, i've purchased a copy of OD+ 1.5 and i have the same problem.
I think that in this version, it's not possible to change the pitch (size) of the font of the label under the icons in the tabbed docks.
It's possible to change the font style and the size of tabs and the font/size of the label text when you pass the mouse over the icons.

If there is someone that has found a solution to this problem, please help us.

The maximum will be to can wrap the labels under the icons on tabbed docks, in 2 or more lines.