But, in fact, if it’s a sub menu link, it’s doesn’t work. I can’t choose “open in a new link”. It’s not displayed (as you can see on my screenshot), however the screen option located on top right corner is selected.
Yes It’s working too, but only to the first level of my menu. For the page on the second level of the menu, this option doesn’t appear. As you can see on my screenshot.
However, I enabled the dashboard option (screenshot 2).