In versions of Windows pre-10 there was an easy display adjustment to make the backgrounds of all windows appear as a colour other than white (not changing the colour of documents when printed, just changing the colour of the display). 
Specifically I am concerned with Word docs in Office 365..For a while in Windows 10, High Contrast settings worked as an alternative to this, but at some point Office 365 began to let High Contrast settings override features like Tack Changes in word, so you can't see different font colours when High Contrast is on. 
Using a colour filter / inversion is a passable stop-gap, but I really want something that ONLY effects the display colour in Word / Office.
I want a way to change the default display background in all word documents.
For reference, this used to work as well, instead of High Contrast, but it no longer does either:
 help would be appreciated. I am not interested in switching to other word processing software nor does the web-based version of Word have all the features I need (which eliminates two obvious solutions). 
Again, thank you all.