Not quite, although I'm glad to know that as well, thanks.
What I thought was a Jupyter notebook view might actually have just been normal script blocks with their help contents laid out nicely in a column. Still would like to know about the microworld-looking interface, is that available for use?
Just had a look at 7 and if you right-click on empty space in a category and select hide blocks - you can hide any block including custom
7 is still in dev so I haven't used it very much - been caught out in past by using a feature and then it getting pulled before release so I now wait till release before diving in
Plus there is very little documentation about 7 features