Now this is really tricky

The layout wanted is as follows

1 Heading 1: If it's a long heading
...it shall be indented like this


1.1 Heading 2
1.1.1 Heading 3
etc



10 But a long heading in chapter 10
..(or later chapters) will look bad, since
..the indentation is relative the side
..page


Is there any practical solution?

The document will be used as a template.

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Adjust your style setting for Heading 1 so that any indent will be at the same location for Chapter 1 through Chapter 10 (or above). It may look slightly off in Chapters 1-9 but, if you want alignment from Chapters 10 and above using the same style, you are going to have to sacrifice one option to get the other.

Yes I think that is the best solution

Other ways would be to make another format to use for higher levels and connect to "Heading 6" (which is not used yet)
But I foresee troubles.

Third possible solution is to instruct the user to manually indent "long chapter headings above 10"

Also this solution is bound for trouble.

Fourth: Make one template for big documents with long headings and another for not so big docs.

I will vote for the first

If you want a hanging indent for each heading, do the following in the dialog box in your screen shot: Leave "Justerad till" at zero. Change "Avgränsare efter listtecken" to "Tabb" (tab stop) and specify a value for "Lägg till tabbstopp vid" that matches "Textindrag vid."

"Lägg till tabbstopp vid" determines the location of the first line of text (after the list number), and "Textindrag vid" determines where the second and subsequent text lines start (applies to multilevel numbered paragraphs). These values are measured from the left margin, and some trial and error may be required to find the appropriate value.

__________________
Stefan Blom
Microsoft Word MVP

Microsoft 365 apps for business
Windows 11 Professional