I am filing this as a sibling issue to #3995
In the WP dashboard, the "Welcome to WordPress!" block can be dismissed (per user), via a link at the top-right:

We should introduce such a feature as well; perhaps in a way that it can be reused by other blocks too.
GitHub Issue #:
3996
Recent comments
Amilenkov's suggestions are spot on. As for the greyed out Menu module, that's because there must be another module that depends on Menu. Core will gray out modules that cannot be disabled (e.g...
menu partially working
Welcome to the Backdrop community! My first suspicion would be access to the destination page. Backdrop checks access when building the menu, so a link can be enabled but still be hidden...
menu partially working
here's the view when not logged in (ie with no 'sustainable computing' visible but is visible when i login as admin:
menu partially working