Olly, thx for the reply.
How these are sorted, I did understand already and is logical.
I already found out how this works an was able to change it. It isn’t the theme “Kale Pro” that I use that controls this number. The number is used from a setting in wordpress itself. For other people this might also be handy to know, so here’s the solution:
Login to your WordPress dashboard and go to Settings » Reading page. Next, you need to change the value of ‘Blog pages show at most’ option to any number of posts you want to display.
This is by default set to “10”. Don’t forget to click on the ‘Save Changes’ button to store your settings!