I think I remember at the very top, in the action bar there is a button among the data, terrain, and trigger buttons at the top there is one with a fancy looking A (I think it is an A, don't have the editor available to me atm). Take a look in there and see if you can change font size.
Either that or if you are using the normal UI use black dialog items to block them if all else fails.
Thx for answer, ye it is possible to customize styles here, but the mininimum font size is set at 8. I managed to move it away somehow after trying more(added one more anchor, and set offset to crazy number).