I'm not even close to being a graphic designer. What I do is compare my layout to the layouts of similar games--in a one page or two page I look to Lasers and Feelings primarily but any ttrpg could work--and ask myself if it flows or looks at least comparably to that game. If not, I try to fix the issues keeping it from looking right. Like, alternating the fill color on each row of a table or adding a column to separate them then removing the lines for a smoother look, etc.