Thanks for the reply Uwe.
I already found the documentation with instructions on how to add the slider but the instructions do not give info on how to set up the locations of these sidebars. Yes, it says that the sidebars do not have to be assigned to a location as they are going to be used for the homepage but the menu (beneath the screenshotted zone) still lets me choose a template to edit.
The locations are now set up to [none] and the template dropdown menu says ‘404’.
The header is now shown on every page but the homepage. And home is the page I want it to be displayed and not on the other pages.
Website: http://www.joelnahuis.nl
Joël