Scroll arrow down button is hidden on Modern UX Task List Board View for columns

Document ID : KB000125429
Last Modified Date : 06/02/2019
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When using the Board View of the task list in the Modern UX, the scroll down button (arrow button) is hidden. Just a few pixels are clickable.
User-added image
This issue has been reported for Clarity PPM
It is still possible to scroll down the column using the scroll bar instead of the 'down arrow'.
We are planning to replace this board with the new generic board component which provides additional capabilities.