What kind of computer are you running it on? I checked CoC 6 and 7 on both laptops (15" Windows, 16" Linux) and it looks ok at normal working distance to me. The gray lettering for stuff that's not valid or just informational (like the dice for Attributes or Skills you haven't put points in) are pretty dim but readable. Depending on how brightly lit the room is, you might need to adjust the brightness or contrast on the display, ambient light might be washing it out.
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