Two row headers without stepped layout

You can control row subtotals for each field. That allows you to keep the row total but suppress all subtotals, for example.

Thanks, I now switched on the "Apply settings to: Per row level"

I don't know, why I haven't figured that out earlier, because before I wrote this thread, I have clicked around everywhere in the settings. 🤔
And I don't understand why the option "Per row level: on" causes it to let the subtotals disappear, but the main thing is that it works.