[Resolved] need to disable plugin , because our classic mode not opening

Background of the issue:
I am trying to edit a post using the classic mode on my WordPress site. The issue can be seen on this page: hidden link

Symptoms:
When I click on classic mode to edit the post, there is a blank space instead of the content.

Questions:
How can I resolve the issue of classic mode not displaying content?
Is there a way to disable the plugin to fix the classic mode issue?