I've redone the parameters in my nightmode.ini like this :
# config file for kobo-nightmode
[state]
invertActive = yes
retainStateOverRestart = yes
[control]
longPressDurationMS = 400
[nightmode]
refreshScreenPages = 90
I don't understand why it"s what was not ok last time (the file have been saved because I had verified). Now it's work well !!!
Nice work again Yoq ! really big thanks

!!!