Groups on the wrong side.
It is intuitive for workflow in a menu to move from left to right as this is how we read. This is how Whisker used to work (version 2.4.3). Now, however groups are on the wrong side (anchored right) so you have to go to the right to pick a group and have to back track to the left to see the contents. This is counter intuitive. Please restore the flow with groups on the left and content on the right like it used to be, or create an option with a tic box for doing so. This new layout is awkward.