Is there an option that I can determine how many posts he shows? So I want "Grid Posts" to show only 4 posts and "Classic Posts" everything?
Attached files: ticket.PNG
For the moment no, the amount of displayed posts is determinated by your settings -> reading option, that will work for both lists (grid and classic).
Just thinking about it, i believe there should be added an option to limit lists separately.
I added this to my to-do list so it will be implemented on the next update.