Site-wide settings
Below the skins are settings that apply to the whole site. Most are set up once by a developer; the ones a Themer may need are:
Chart colours — the default series colours for Chart components, as hex codes separated by spaces.
External links — style external links, open them in a new window, and optionally show a pop-up message when leaving the site, with a regex of domains that trigger it.
Import redirects — paste a two-column CSV of
source,destinationpaths to create redirects in bulk.Look and Feel — apply a "look" (a bundle of modifiers) to pages by context rather than one page at a time; see below.
Meta — extra meta tags built from page fields; see below.
Schema.org, Prefetch, ReadSpeaker, Convivial profiler, Matomo, Recombee tracker — integrations; leave to your developer.

Look and Feel
Look and Feel applies a look — a set of modifiers such as a background or palette — to whole areas of the site based on what page is being shown, instead of an editor setting it on each page. Tick Enable Look and Feel, then configure:

Field selectors — one
field|selectormapping per line, saying which field on the looked-up entity holds the modifiers.Complete strategies and Partial strategies — one
strategy|parametersrule per line, evaluated in order. Complete applies only the first matching look; Partial applies every matching look.entity|node,taxonomy_term— take the look from the page's own entity.reference|field_section— take it from the entity in that reference field, e.g. the page's Section.path|/section/*,taxonomy_term,section-a— when the URL matches, use the look with keysection-afrom the taxonomy terms.apply|taxonomy_term,section-a— always use the look with keysection-a.
Meta
The Meta feature emits extra <meta> tags from page values, one rule per line in the form strategy,key,params,attributes,bundles:

constant,site,alpha— a fixed value.bundle,type— the page's content type.values,summary,field_summary(orvalue,…for a single string) — a field value.references,topic,field_topics|field_identifier(orreference,…) — a field from a referenced entity.token,type,[node:content-type]— a token.
Add attr1=x|attr2=y to set extra attributes and page|article to limit the tag to those content types, e.g. token,topic,[node:field_topic],,page|article.
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