1. align to top
2. arrange lines

The first align to top:

1. Select all fields on the row, right click, align to top
2. move the selection to the top of details section (no space between the details section and the section above
3. remove remaining space at the bottom of the details section

The second:

1. right click details
2. click on arrange lines
3. right click details again
4. click on fit section

This solved the issue for me.

Sometimes only the first part is necesarry.