If you would like to completely remove comments from Capture, you can install this helpful plugin to disable all comments on the site: https://wordpress.org/plugins/disable-comments/
If you are just looking to hide the "Leave an Observation" and "Observations Closed" text, you will want to add this code to the CSS stylesheet of your child theme:
To remove everything from the below the footer, you want to use this:
Hope this helps! Thank you!