Here is a 1920 x 1080 screen @100% scaling and default zoom level in Firefox, your view may appear differently, depending on settings...
View attachment 345451
Your desktop may support the shortcut "Ctrl, Alt & Arrow keys" to rotate the display.
Many thanks, that's just what I wanted I'm interested to see that the website is centred on the screen, with blank borders each side. I didn't know whether it would somehow spread out to fill the whole screen.
I am using default settings on Chrome.
What is the size (diagonal) of your monitor? I have done a rough calculation that 24 inches at 1920 x 1080 would make everything a similar size to my 19 inch at 1280 x 1024 and give me a similar working area for Word documents.