Hi @Lobsterass,
It seems that a custom sidebar has been created and assigned to those categories. To get the widgets in those pages, you need to add the widget into that respective sidebar named Inbrottslarm or deselect the categories from custom sidebar options.
Please find the screenshot describing the settings of the custom sidebar.
Regretfully, there is no such option for the category checkbox filter(s), is required customization and beyond the scope of our theme support. I would suggest you hire a developer who can assist you to do the customization or you can avail of our newly launched service called One, where the customization questions are answered.
Alternatively, you can try with the following free plugin from WordPress repository, which may help you.
Please remember that we don’t offer any support or investigation on 3rd party plugins or related issues.
Thanks