Shift + Space not working in painter 2019 ?

hello,

i recently acquired Painter 2019 , I want to use it to paint seamless textures for Unity game engine.

After reading the 2019 manual and watching several videos on youtube .. all say that i need to use the " Shift + Space " shortcut to move the pivot/axis? of the picture .. in order to see and repaint the borders to make them seamless ( like this ).

Unfortunately, when i press " Shift + Space ", nothing happens .. same than just pressing Shift..

I have looked in the Shortcut manager and couldnt find where to assign this function either .. i also made sure it was by default too..

i really need this to work .. anybody has any suggestion ?

thank you for your time