I have found an interesting question in our Support Knowledge Base,
How can I change the font size in a Condition box?
You can change the font size in any condition box.
You just have to press CTRL and scroll up or down using your mouse’s wheel to increase or decrease the font size.
Note that the new font size will be changed to all similar condition boxes (not only to the one in which you made the change).
Here you can see an example:
