Read More
Collapsible content area with animated expand/collapse triggered by a read-more link. It is shown in the block inserter as Canvas Read More and registered as canvas-core/read-more.
Select the block on a page and its own settings open in the sidebar, in the panels below:
Settings
Each setting is named exactly as the block editor names it, followed by what it does and what it starts as. Where a setting carries a Shown when line, it stays hidden until that condition is met, which is the usual reason a setting looks missing from the sidebar:
Content
Content (legacy)DefaultEmpty
Legacy fallback only: new content is added as nested blocks inside the collapsible area.
Expand LabelDefault
Read MoreInline markup is allowed, so an icon glyph can be part of (or all of) the label.
Collapse LabelDefault
Read LessSet to false to make the reveal one-way: the trigger removes itself once the content is open.
Trigger ClassesDefaultEmpty
Class list on the trigger anchor. read-more-trigger is always added (it is the selector the module looks for); add read-more-trigger-center or read-more-trigger-right to move it.
Settings
Collapsed HeightDefaultEmpty
How much of the content stays visible before the reader expands it. Leave empty for the theme default of 10rem.
Animation Speed (ms)Default
500How long the expand and collapse movement takes, in milliseconds. Lower it for a snappier reveal.
Scroll Up on CollapseDefaultOff
Return the reader to the top of the passage when it closes.
Fade MaskDefaultOn
The gradient that fades the collapsed preview into the page background.
Mask ColorDefaultEmpty
Match the surface behind the content. Defaults to white.
Shown when Fade Mask is on
Mask HeightDefaultEmpty
How far up the fade reaches from the bottom of the collapsed preview. Lower it for a shorter, sharper fade.
Shown when Fade Mask is on
Related
Every Canvas block also carries the Animation, Scroll Effects and Advanced panels, which are described in Controls every Canvas block has.
Other blocks in Canvas: Alerts, Buttons, Code Highlight, Counters, Dividers, Dropcaps.

