Blue Ocean shows a flattened list of jobs on its "bashboard" that is limited to a fixed number of items. Trying to show more items is extremely annoying.
Aaaand it's ordered alphabetically.
A typical organization will have projects in Jenkins that haven't been built in a while. In fact, I expect that the relevance of a project to a user starting at the dashboard can in many cases be approximated by its most recent build activity, i.e. a project recently built is likely more relevant than one that hasn't been built in a while.
Therefore the dashboard should at least optionally allow to show items by date of last activity on any branch, or e.g. show items alphabetically, but limit the initial set of N items shown to those N most recently active ones.