First of all click on “Edit with elementor” button. You will reach the elementor edit page. You will be able to find the widget “Post Filter widget” :

Further you can adjust the layout of the section via “Advanced” setting option.

• Post Filter:
  • Title: This option allows you to edit the title of the widget.
  • Posts Category: This option allows you to chose the category that you want to display in the widget.
  • Total Posts: This option will allow you to adjust the number of post to be displayed in this section.