Flector

You can use this plugin to hide part of the text of a post in a nicely-formatted container that will becomes unhidden when clicked on. The plugin can be useful for creating FAQ pages, hiding large pictures, and things like that.
The plugin creates its own “Spoiler” button in the visual editor, but you can also add spoilers directly using tags. For example:
<pre><code>[spoiler title='Title']Spoiler content[/spoiler]
</code></pre>
or
<pre><code>[spoiler title='Title' collapse_link='no']Spoiler content[/spoiler]
</code></pre>
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BBSpoiler

This plugin allows you to hide text under the tags [spoiler]your text[/spoiler].

Robert Noakes

Simple plugin that stylizes Advanced Custom Fields meta boxes to make them more obvious. It works with both the free and the pro versions of ACF. You now have the option to make seamless meta boxes stand out better as well.
<a href="https://noakesplugins.com/kb/acf-stylizer/" rel="nofollow ugc">View the Knowledge Base »</a>

ACF Stylizer

Simple plugin that stylizes Advanced Custom Fields meta boxes to make them more obvious.

BBSpoiler vs ACF Stylizer