Sometimes office programs do no resize when you move from one monitor to another if there different resolutions. To fix this you do the following. I use Powerpoint as an example.

1) Go to C:\Program Files\Microsoft Office 15\root\office15

2) Right-click on powerpnt.exe.manifest and change the permission so you can modify the file

3) Right-click on powerpnt.exe.manifest and open with Wordpad

4) Change the line

    True/PM
    to

    False/PM
5) Save file

The office program will then resize.