diff --git a/modules/ui/popup/config.el b/modules/ui/popup/config.el
index 17d36419b..47efdbabc 100644
--- a/modules/ui/popup/config.el
+++ b/modules/ui/popup/config.el
@@ -147,7 +147,7 @@ prevent the popup(s) from messing up the UI (or vice versa)."
       ("^\\*Calc"
        :vslot -7 :side bottom :size 0.4 :select t :quit nil :ttl 0)
       ("^\\*Customize"
-       :slot 2 :side right :select t :quit t)
+       :slot 2 :side right :size 0.5 :select t :quit nil)
       ("^ \\*undo-tree\\*"
        :slot 2 :side left :size 20 :select t :quit t)
       ;; `help-mode', `helpful-mode'