Hi thefbi,
Of course, the "category solution" is very awkward and impractical.
However, this will work perfectly fine:
thefbi wrote: And if i put for example in the grid select, 4x7, it will show 28 products. So it can work, if i can hide the pagination for this layout only ?
Yes, exactly. So, create a menu item of the type product listing, set the grid as you need and configure it to display products from all categories, sorted by created date / descending. Then hide the pagination per CSS in this listing only. No problem at all.
Alternatively you could use a Module as well, of course.