Hi MarkG2021,
I am Jaspreet Singh an independent advisor.
When you click on the box labelled Apps and websites it will highlight a bar at the lower part of the screen. click on the language that is selected in the bar (it should be Japanese) and you should see an arrow up and an arrow down. click on down arrow untill the language you want is at the top most. Then close settings and restart the system.
here is a video I made explaining it all. https://1drv.ms/v/s!At2Hur_8KeBSnDeCasWxMmEt9oRn