Zoomed out browser....I hadn't even thought of that!. In the uk now it's midnight so I'll check that in the morning. Thank you

It looks perfectly fine on my Google Chrome, Windows 10 Laptop
Maybe you have your browser zoomed out. Set it to 100% and see how it looks or try a different browser. I have attached what I see.

And when I write either new posts or pages, or refer back to previous ones all the content and images will only allow me to only use half of the white box as shown below

This is how it looks on my laptop and pc ie moved over to the left with a blank strip down the side. This strip isn't a primary or side bar as I've used them with widgets and ads

Does your theme support only on column

There is more not quite oke, your header is not displaying right too, the black margin is not here though
Your theme is anjirai?

Hi, kirby34. I just looked at your site and on my screen there is a large black margin on the left. Everything else looks great but that blank space is a bit distracting. Are you sure your theme doesn't include a column on the left?

Hi I actually like the side bars on the right, and the content on the left... that would eliminate the problem of having a blank side of the screen on the right, and makes it easier to read, and to me looks better....
I find the sidebar on the left distracting ... just my two cents :-)