You can right click and make it bigger from the size menu

You can set a bigger default by selecting nothing, then changing the dim size from the dim menu whilst in the dim tool

You can copya text font/size/style using the pipette tool

BUT you cannot change the attributes of the text in the attributes tab of the Object Edit Box

Which is exactly where you'd expect to change an object's attributes

I have asked all Godly and outer-terrestrial bodies .. nobody knows why this is