Hi Miquel,
Sorry for the inconvenience caused, I thought you are using the neighborhood theme, you are using pinpoint..
Directly try this shortcode in a page.
[blog blog_type="standard" item_count="5" category="cat1,cat2" excerpt_length="20" pagination="yes" width="1/1" el_position="first last"]
Cat1, cat2 are the category slugs.
You can put a blog element, and customize it in that page using the swift builder, then click classic editor, now you see a shortcode insert there, in that change the category parameter like the above.
Let me know, what you got.
Thanks,
laranz.