If you only want the sidebar to contain links to pages on the website, you could use text objects and add a border to them using the "Style" option.

Here's an example >> https://findelinks.de/123test-aufklappmenue-2/seite-25-extra-lang.html

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But then the system will not pull the articles (blog entries) by itself and compile the list by itself. This would mean constant manual adjustments.

I mean - this is the oldest website layout and I simply cannot wrap my head around it that this should not be possible with this software. I have uploaded another image to show the context of what I have to achieve.

To display the blog articles as headings as desired, these 3 steps are necessary, which I have just tested myself.

1. On the right side of the page, place the "Article List" object three times, one below the other (see screenshot), and select a different blog category for each object.
2. Uncheck all invisible parts of the three "Article List" objects.
3. Add additional CSS code to hide the DIV containing the image.

        div .im-cc-BlogPostWrapperCardCover { display:none; }

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To make things easier, create the "Article List" object once and configure the settings, then copy and paste the "Article List" object below it. Now just adjust the category and heading for objects 2 and 3.