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.
At least on Moodle 3.10, the unofficial plugin seems to work fine. Did you uninstall the official plugin completely before installing the unofficial one? Make sure the plugin folder onserver is removed completely after uninstall, and I would also do a "Purge Caches" action and also clear my browser cache before installing and checking the new unofficial plugin.
It should be a core block now with the new possibilities of Moodle 4.0
So happy to see this plugin living and breathing again! It's a game changer.
However, like Peter, I am having issues copying content between courses. I am full site Admin and when I go to Duplicate to another course, the dropdown menu is completely empty.
Any ideas?
@Peter Diederichs: This should also answer your question?
But I have no idea how to find or create the box you illustrate above (far left). A step by step guide is needed for those who have never used a plugin.