thanks for your reply.
i’ve continued searching for a solution myself and found an option in the Weaver theme where you can turn off the widget-areas for single posts. Problem solved!
I am using the Weaver theme in combination with FAQ Manager. Any idea how I can change the template for the single question page?
It now uses the ‘standard’ template and displays all(!) my widgets on the right hand side. I would like to use another template for the single question page(for instance without any widget area).