PowerPoint係簡報開始時會轉成extend screen，但完結後就唔會轉返轉頭。唔想咁樣，可以點樣？
If you find PowerPoint 2013’s habit of changing multi-display setting without changing back annoying. How to fix this issue?

入registry更改以下設定：
Change the following registry key:
[HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\PowerPoint\Options]
“RestoreTopology”=dword:00000001

If you do not like editing registry yoyurself, you can create a file that fix the issue for you:
http://answers.microsoft.com/en-us/office/forum/office_2013_release-powerpoint/powerpoint-2013-changes-display-setup/3ca470a0-d896-4577-b724-a360b6bf1c4e?auth=1