Mark W thank you TAB worked out but I have not been fair asking for a solution to my 'problem' regarding multi windows. I have attached a screenshot showing the situation. The first time I was aware of a problem was when AF icon just bobbed up and down when I selected it. I then right-clicked>Show all widows, and was presented by a similar display to that in the screenshot. In subsequent visits, some have disappeared and some not. This whilst repeating the same basic commands in AF, but whilst trying various methods of saving to Apple Photos. Hence my worry that this is somehow the cause.
I have decided, somewhat belatedly, to save to an AF document and then if I need to, to Export to Photos.
Roger