Customize Widgets - WP Show Posts List

Hello,

I created a list via "WP Show Posts" and added in the right sidebar about a widget.

All WP Show Posts have a title that is rendered as an <h2> tag. This is not ideal for seo. It is possible to change this tag?
Example:
<h2> class="widget-title">Spezialthemen</h2> to <span class="widget-title">Spezialthemen</span>

In my widget I need only a post header list and not content from the post and also buttons. Is it possible to deactivate all other things so that the html-content is clean.

Delete the entire area:
<div class="wp-show-posts-entry-summary" itemprop="text">

Code excample:
https://drive.google.com/file/d/1bjpNC9v165SkCeW8WBmqX5ok3kANjrL6/view?usp=sharing