When I import or open a new project, a notification appears on the right side. How can I fire them from the keyboard?
A key card has recently been added to mark all notifications as read. By default, it is empty, but you can install it on any shortcut that you would like.
There is currently no shortcut for closing pop-ups that appear as balloons when launching IntelliJ.
What you can do is permanently disable them File | Settings | Appearance and behavior | Notifications
: https://www.jetbrains.com/idea/help/notifications.html
Ctrl + tab, ctrl + a (Go to the event log)
Application menu key (next to the right control key) and "Clear all".
Note that this will clear the entire event log, but at least it will reject these notifications.