My Linux Cinnamon has just upgraded LO to 5.1.6.2
What has driven me crazy, in Writer (at least so far) the page colour on the screen for all my documents has changed from white to grey.
How can I get it back to white? Why did it change anyway? Have I screwed something up?
Tools > Options > LibreOffice > Application Colors :: General > Document Background
Why did it change anyway?.. My Linux Cinnamon has just upgraded LO to 5.1.6.2
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Probably the Office user profile folder has got some wrong information. If there is something weirder than before you should rename/erase it so that LO can generate a new one.
Have I screwed something up?
One never knows… 
Thanks for the straightforward answer.
The document colour already said white, but I changed it to another colour, then back to white again.
Now seems OK, thanks again.