What about the idea of adding a "collapse" to the UI display of custom fields?

[penM000]

I believe there are situations where you may want to put a very long string in a custom field, or you may want to see the data only when needed.
Currently, custom fields have the following display modes
Always".
If set
Hidden".

I am wondering if "folding" could be added to this list.
For a concrete implementation, it is possible to use HTML details.

Example of current state

Example of folding by details

Example expanded by details

What do you guys think of this idea?
Thank you in advance.

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