Managing blocks
From MoodleDocs
This page allows you to configure the behaviour of blocks on your site.
Name
Instances
This number tells you how many times a particular type of block is used in the courses on your Moodle site.
Version
Hide/Show
Multiple
Some blocks can be added multiple times to the same course. This of course is supported only by blocks for which it makes sense. For example, it makes sense to have two HTML blocks (and configure each one to show something different), but it doesn't make sense to have two Administration blocks. For those blocks which do support multiple instances, the administrator can choose to allow it or not. This is the purpose of the "Multiple" column.