In the BlocksModule settings, an admin may enable block collapse icons. This feature adds a small icon next to each block title that when clicked will 'minimize' (collapse) the block. The icon can be clicked again to maximize or restore the block.
Block developers should enclose all the block content in a block-level element (
<ul> or similar) in order
to take full advantage of the feature.
Block developers can disable the "collapsibility" of a block by adding the
nonCollapsible class to the Html element
that immediately follows the title element (likely the block-level element referenced above).