Problem/Motivation
The form at admin/config/regional/content-language can easily get really big and complicated. On a site with several types for nodes, media, paragraphs, and taxonomy, it becomes very hard to navigate.
Steps to reproduce
Proposed resolution
In #3027607: Submitting the form on admin/config/regional/content-language times out because it is enormous, it's been suggested that the form be split up, for UX and performance. But that is going to be a complex change.
A quick easy interim fix would be to convert the 'container' form elements for each entity type into collapsed 'details' elements. This would allow admin users to only show the settings for the entity type they are working on.
Remaining tasks
User interface changes
The form has collapsible details elements.
API changes
We'd probably remove the H4 element from the twig template, as it just repeats the title on the details element.