I realise that you should be able to grab and slide view layers to close them. I have done this successfully in the past. However, as a NOOB, I managed to get into a complete mess with shader windows that, when I tried to slide away, just opened window after window. I do realise it will be because I got the grab and slide wrong. However, they are not now in any position to slide over each other and I also cannot merge them for similar reasons. They are lying one on top of the other and grab does not achieve anything. Is there another way of closing these?