As a user of Next-Gen Jira I want to add issues directly to the board when Sprints feature is on

At this time, when i turn on Sprints feature from project settings add buttons in board columns just disappear.

It seems that Jira designers decided for users that its not good idea to add new issues to running sprint (board). So they make it hard for them! Only option how to add issue to the running sprint is add it to the backlog and than move it manually to the sprint (board).