Editing after preview

Let us try:
It doesn't seem to work: no grayed zone seems to be present:
ScrSh1.png
 
You have to push the Preview button twice, first to turn on the preview and when you are finished with the preview then you have to push the button one more time to turn off the preview function. Then you can edit your post. Hope this helps.🙂
Let us try:

Yes! it works. Not exactly intuitive, but when you know it it will sink in, as it is abundantly needed (in my case anyway)