diff --git a/etc/conf.org b/etc/conf.org
index fdbdd6e..e1ab75c 100644
--- a/etc/conf.org
+++ b/etc/conf.org
@@ -3331,6 +3331,12 @@ Initialize by running =nd/mu-init=.
                (smtpmail-smtp-user . ,addr)
                (user-mail-address . ,addr)
                (mu4e-maildir-shortcuts . ,shortcuts)))))
+
+  ;; display mu4e in same window
+  (add-to-list 'display-buffer-alist
+               `(,(regexp-quote mu4e-main-buffer-name)
+                 display-buffer-same-window))
+
   (setq mail-user-agent 'mu4e-user-agent
         message-kill-buffer-on-exit t