Make the font for the first heading larger!

config.el

@@ -47,6 +47,14 @@
       org-edit-src-content-indentation 0)
 (add-hook 'org-mode-hook (lambda () (org-bullets-mode 1)))
 
+;; Custom font sizes for the headings
+(custom-set-faces
+ '(org-level-1 ((t (:inherit outline-1 :height 1.2))))
+ '(org-level-2 ((t (:inherit outline-2 :height 1.0))))
+ '(org-level-3 ((t (:inherit outline-3 :height 1.0))))
+ '(org-level-4 ((t (:inherit outline-4 :height 1.0))))
+ '(org-level-5 ((t (:inherit outline-5 :height 1.0)))))
+
 ;; Here are some additional functions/macros that could help you configure Doom:
 ;;
 ;; - `load!' for loading external *.el files relative to this one