Hello,

@ me33

1) These arrows only appear when the directions are not represented by the large panels at the top of the screen (screenshot 1).

Spoiler: Screenshot 1
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Or when you click on the panels at the top, which makes them disappear and the arrows at the bottom of the screen appear. (screenshot 2).

Spoiler: Screenshot 2
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2) Where and when these indications should be displayed are determined by the ".fbl" files (map).
It is therefore not possible (in my opinion) to have a permanent display of these indications.