I am using a kanban board in a team managed project. It used to be easy to clear all Done tickets from the board, with the three dot options at the top of the done column header. This was previously answered here.

However with the new Jira UI, the three dot options are missing from the column headers. There doesn't seem to be any way to now clear done tickets from the board. I don't want to have to wait 2 weeks for them to clear automatically. I have looked in all the board settings including the column configurations which does not have this option either.
Board view:

Column settings:

Where has this functionality gone?