So I have been noticing that for some reason, some Microsoft Office apps is starting to use my nVidia dGPU, even though I have set it to use integrated graphics using the nVidia Control Panel app.
I would see the following in my tray:
The only way for me to get rid of them is to disable my nVidia dGPU from device manager.
Until I stumbled onto this link:
So I followed the article and turn off hardware graphics acceleration in Outlook 2016, and even without restarting Outlook, all the Microsoft Office apps stopped using the nVidia GPU:
So hopefully this helps someone :)