WPF Sub-MenuItem Opening on the Left Instead of the Right

Question

I have set up a simple sample menu.

Answer 1

Does this happen on other applications on your system as well?

There's a registry setting in the value MenuDropAlignment in the key HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\Windows that controls it system-wide. You might just check to make sure that it is set to 0 instead of 1.

More info can be found in this article.