A selection of view modes would be a good addition to Styleguide.
Add a submodule styleguide_view_mode that displays examples of configured entity view modes to Style guide, using hook_styleguide() and a config to limit the selection.
A new configuration UI to limit entity types, bundles, and view modes.
None.
Somewhat related: ✨ Create sample nodes for display Closed: won't fix
Closed: won't fix
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I'm closing this feature request because it hasn't received any attention in over a decade. The separate module that was created has gone unsupported for nearly the same length of time.
If someone else wants this feature, then they should go request maintainership of http://drupal.org/project/styleguide_view_mode and fix it up. If you do, then feel free to report back here and ask that we link to it.