How to change the font size of inspector pane?

I am regret of buying the 13" MBA because it stresses my eyes with so small font size. Then I connect my 22" displayer to MBA and change “binder” “main editor” font size to 18, it looks good but how can I change size for inspector pane? All text and icons are so small and my eyes hurt.

Finally I changed the resolution of my screens, and everything looks fine.