The More block is used to indicate the content which should be shown in an excerpt, on the blog or category list pages, or search results, for example.
Only content above the More block will be shown on those archive (or list) pages, before the “Read more” link. On the full post or page, all of the content is shown, and the More block is invisible.
Main Layout Blocks
The Columns and Group blocks, along with Cover Image and Media & Text, are the blocks which are most useful in building page layouts. Along with Wide-aligned and Full width options, these blocks allow for a great variety of flexible and attractive page layouts.
The Helper Blocks – Page Break, Spacer, Separator and More – provide help in enhancing layouts, or meeting specific layout needs.