one staff for one player, playing two or more instruments

Hi, I like very much the idea to assign more then one instrument to some particular player. But…when I add for example piccolo to the flute part, there are 2 separate lines in my score: one for the flute, another - for piccolo. I was expecting to get ONE staff instead of two. Is it possible? How do I setup it?
Bildschirmfoto 2017-06-07 um 15.10.05.png

You get one staff for each instrument in GALLEY view, but they will be combined on one staff in PAGE view…