When inserting a color coding legend, it is too large or the icons are too large with respect to the text.
Enter sizes less than "1" when choosing "color and size". The way this can be done is to choose "1" as the highest value and then use values lower than 1 such as 0.9, 0.8, 0.7 etc. for the rest of the colors. This way you can see the text clearly and in conjunction with the color coding and at a "scaled" version of the index. Be sure to click "Apply". See the below snapshot of an example in which the pressure at junctions is color coded with size;
The result of this approach can be seen in the scaled legend as seen below;
How do you add color coding to an element?
Forum Post - Legend (size of text)