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You can change the color of sketch constraints, but I don't know how to change the font size. Turn off the grid and use a dark background will help see the text. Also, changing the background to Low Light or No Background will help.
A good modeling technique is to keep your sketches simple. Several sketches with several Pads or Pockets and Fillets is better than one Pad made from a single, complex sketch. Plus it will help reading the constraints.
I already use the catia with one colour background and I'm OK with the font size but my teacher asked us to find a way to change the font size, so all the class can see better from the board. Appearantly there is no way, thank you.