You can edit NextMove thank you page with elementor builder as well.

NextMove thank you pages have two styles, one column, and two column. The output of this content is powered by the shortcode [xlwcty_load]. You can create your own template, add images or content on the page and wherever you add the shortcode, it will display the output of your thank you page with the style you chose in thank you page.

Please refer a complete video on how to edit thank you page with elementor:

Source: Dropbox
https://www.dropbox.com/s/db9xonz9baen528/thankyou_elementor.mp4?dl=0