Moodle plugins directory: Mass Actions block | Moodle.org
Mass Actions block
This block allows instructors to perform actions upon multiple resources or activities, rather than having to perform repeated actions on individual items.
To use this block, Javascript must be enabled in your browse and you must be in editing mode in the course home page. The user must have capability "block/massaction:use". The block should work in most course formats.
Supported actions include mass selection, indentation, deletion, hiding, showing, making available, duplicating, and moving. To select items to perform actions on, simply click the checkbox next to the activity or resource or use select functionality from the block. Then click the action you would like to perform in the block.
If you encounter bugs or have suggestions for improvement, please use the bug tracker URL and I will work on those as quickly as possible.
I apologize. That was an oversight on my part and has now been corrected.
Currently, the plugin relies upon using the HTML DOM to discover the modules that are in the course. When your flex sections are collapsed, there are no modules in them for the plugin to discover. This is why it currently does not work with collapsed flex sections. That said, I am expecting to be able to spend time either later this month or in June working on refactoring the plugin to work much better and to be less reliant on the DOM. I'm going to private message you to discuss this further.
Clem