[libreoffice-users] print table without internal borders

Good evening
I am sure, this is a stupid question.
I have a table (cover sheet for medical records) with all sorts of lines
at the top and all around.
However, I would prefer NOT to print the borders between some 30
questions below that.
Only an outer border around the whole thing.

I checked "table properties", format etc., set the area to "no lines"
etc. but so far no setting has
changed how the table looks in the "print preview".

The documentation also gives only the explanations about table
properties etc.

Surely there is a very simple trick. I just cannot figure it out.
If anybody has the time to give me a hint, I would be very grateful.

Thank you.
Thomas

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