Black margins down each side of my screen, so reduced screen size, can anyone help please?

I have 2 black margins down each side of the viewable sceen, I've tried going in to 'full screen mode' but all tha happens is that I lose my footers and headers, the screen view still remains long and narrow rather that filling the screen top to bottom and sise to side. Can anyone help please?

I think the reason your screen looks like this is because the screen was somehow scaled differently in System Preferences. To fix this open up the System Preferences app and click on "Displays". Next click on "Scaled" and make sure it says "1280 x 800" or the top one in the list so it should look like this:
Then that's it.
If this doesn't work try restarting your MacBook Pro or resetting the SMC or PRAM.
Hope this helps,
- Daniel 

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