Doodlebee

Simple plugin to show/hide comment replies, rather than have them all listed. An options page makes it really easy to change different parts of your comment calls.
<h4>Features</h4>
This keeps the default “<a href="https://codex.wordpress.org/Function_Reference/wp_list_comments" rel="nofollow ugc"><code>wp_list_comments()</code></a>” features. A clickable span that triggers the action to expand the replies is also added.
New features are including easing options, as well as allowing images. An options page has been added for further customizations, making it even easier to use.
<h3>Other Info</h3>
<h4>Known Issues</h4>
None at this time.
<a href="http://brassblogs.com/contact" rel="nofollow ugc">Contact Shelly</a>
Given that this is free, I offer limited support. If you have issues with the plugin working I will do whatever I can to help you fix the issue, but when it comes to customization, I’m in limited supply. I’ll do what I can, but no guarantees. This is your standard “as is” application. In all honesty, ask customization questions in the forums – if I can’t help, perhaps someone else can. (If you want to hire me to customize it, that’s another story – feel free to contact me to do so!)
PLEASE NOTE that the WordPress support system DOES NOT notify me when someone leaves a support question. It requires me to come back and check manually to see if anyone has had an issue. Sometimes, I don’t get to do that for a while. If you left a support request on the forums, and it’s been at least a week since you left it with no response, please drop me an email to let me know so I can attempt to help you out. I’m pretty good at helping out – but I’m not so good at coming to check the forums – especially when I’m busy with client work.

jQuery Comment Replies

Make your multi-level comment replies show on demand with a slick jQuery slideToggle() action.

liaison

The Collexpander WordPress plugin allows you to hide or show selected text content dynamically with a toggle button. 
It’s useful when you want to display long descriptions, FAQs, technical documentation, or additional product details without overwhelming the reader.
Simply insert the shortcode pair in your post or page:
[collexpander-show-content] 
  
[collexpander-hide-content]
Everything placed between the two shortcodes will be initially hidden, and can be expanded or collapsed when the visitor clicks the toggle button.
The plugin includes three customizable button styles (default, outline, and minimal) and two button text options (e.g., “Show” / “Hide” or “More” / “Less”). 
You can also easily adjust button labels, colors.
This plugin helps improve content readability and provides a clean, user-friendly experience — ideal for blogs, product pages, FAQs, and educational content where text organization and clarity matter.

collexpander

The Collexpander WordPress plugin allows you to hide or show selected text content dynamically with a toggle button.

jQuery Comment Replies vs collexpander