In New UX once you add comments we are not able to Remove it. Is there an option to Reset the page with no comments or we have to create a new page altogether.
this is unfortunately not possible at this moment. I posted that on Idea Exchange https://community.anaplan.com/t5/Idea-Exchange/NUX-Comments-Delete-amp-Tag/idi-p/90205
The only workaround is to remove the card and publish it again.