I was thinking the thinning did not work for me when I found this in history.txt:
What is the reasoning behind not applying history thinning to Alt-Left? Would it be considered too confusing?16.10.19 Release Total Commander 9.50 beta 1
14.07.19 Added: Directory history thinning: Keep normal history (Alt+Left/Right arrow) unchanged, only apply to history menu (Alt+Down arrow) (32/64)
TIA
Roman