I had researched those links and ticked all the boxes to match the tutorials. I just reset the slider settings and started from scratch and it started working. The temperory slider images are there to check for size they are 1140 x 400 px but they don’t fill the screen. In fact, everything, (not just the slider) is off centre. Can you see how it’s all on the left side? very strange indeed.
I notice too that on the mobile view the logo, slider and other images are also off centre. What could this be?