Left and right arrow keys old behaviour

Hi guys,
I just updated my ardour from 5.4 to 5.8 (windows) and, as the change log reports, the left and right arrow keys changed behavior. The change log says that it is possible to restore the old behavior via modifiers, I thought via menu Edit -> Preferences -> Modifiers, but I cannot how to change it. Can anyone help me? Thank you.

+1 on this post,
it was really nice to go to the next region end/start with those arrows…

You can access the old behaviour via Shift+Alt+Left/Right or can revert to the old behavioiur via the Keyboard Shortcuts dialog (Alt+K) by changing the default shortcut for the Editor -> Playhead to Next/Previous region boundary to Left/Right arrow keys.

The Preferences -> Editor -> Modifers page is not related to this functionality.