NRIN

Thanks again, but unfortunately it still isn’t working…

Thanks for your suggestion. Unfortunately is not working yet.
I’ve got two questions:
1) do I have to paste the suggested code at a specific place in functions.php, or can I put it anywhere? (so far, I don’t have anything else in the child theme functions, does it require something else?)
And 2) do I separate the id-numbers of the two categories by a comma, or both between ‘ ‘ with a space in between, or something else…?
Thank you!

OK, will do, thank you!

I use the Frontier Theme.

To add some more info on what doesn’t work:
I made a page on which I listed the News and Agenda posts using a plugin, that works. But when I set this page as my static homepage, it does not show.
Somehow, no static page is shown (regardless of which page I choose as home page).
So a static homepage with a non-static function seemed a solution, but unfortunately is not.