Submitted info
The node template has a section for displaying the author and date created.
This is from starterkit, with some extra classes.
{% if display_submitted %}
<footer class="node__meta">
{{ author_picture }}
<div{{ author_attributes.addClass('node__submitted') }}>
{% trans %}Submitted by {{ author_name }} on {{ date }}{% endtrans %}
{{ metadata }}
</div>
</footer>
{% endif %}
This is fairly easy to customize in templates, but since this is a shared theme, I'm looking for a UI solution.
I don't see any modules that help with this.
Here is the full default node template:
<article{{ attributes }}>
{{ title_prefix }}
{% if label and not page %}
<h2{{ title_attributes }}>
<a href="{{ url }}" rel="bookmark">{{ label }}</a>
</h2>
{% endif %}
{{ title_suffix }}
{% if display_submitted %}
<footer>
{{ author_picture }}
<div{{ author_attributes }}>
{% trans %}Submitted by {{ author_name }} on {{ date }}{% endtrans %}
{{ metadata }}
</div>
</footer>
{% endif %}
<div{{ content_attributes }}>
{{ content }}
</div>
</article>
When rendered with layout builder, the layout fills in {{ content }}.
If a node layout was created, with regions for the title, meta, and content, the node template could be reduced to:
<article{{ attributes.addClass(classes) }}>
{{ title_prefix }}
<div{{ content_attributes }}>
{{ content }}
</div>
{{ title_suffix }}
</article>