Hope template size of article/ aim of menu

I am using Joomla 4 with the JP Hope template.
The unchanged standard menu shows articles but they are not using the complete width of the 12column layout.
My question is:
a) Which setting will make the articles use all 12 columns? the row is marked "no container". I tried a 1200px content: it goes over the
right border of the layout with a setoff on the left side while "100%" CSS-entry puts it centered with a setoff on both sides.
b) Which setting can change the aim of menu items? I just found a link to all positions but no entry for the aim of a particular menu item
I could then easily use a custom row configured for complete width.

Maybe a silly but important question: which content section is the default aim of the menu? is it the "content area"?

Thank you very much!

First of all, the following note: This is a German-speaking support forum. Therefore, please write in German.

Bitte liefern Sie alle geforderten Angaben:
Joomla Version, PHP-Version, Framework-Version (Astroid ?), genaue Template-Version und Bezeichnung (JP Templates werden nicht mehr supportet und wurden schon lange durch TP-Templates ersetzt).

UND Link zur Webseite.