I have dozens of columns, and when I have seen everything in one I currently have to click the menu dropdown for each column and then click the “Clear” button – two steps, two clicks including pointer-hunting (avoiding “Delete”), highlighted in red ovals here:

What I want is a configuration setting that provides an extra “clear” widget in each column’s titlebar, perhaps where the yellow square is, which clears/marks as read the entire column.

Please? Does not have to be default. Make it a “live dangerously” option.