Yes, but I did not realize that for “normal” pages (without swift page builder), the sytem menu work differently: bar tools and stops up to the top.
With “normal” pages, it works very well in Flexform and TwentyFourteen
With Swift Page Builder, it does not work: if there is a lot of text and you want syliser the text below, the toolbar disappears when you go down the srcollbar
Sorry for the confusion!