If you look at the exposed storage on your Kobo, do you see a directory named .adds? Inside the .adds directory, you should see a directory named nm. Inside the nm directory, you should see a file called doc (the original NickelMenu documentation file with everything commented out) and files whatever they might be called which would be the source for NickelMenu's menus. After installing the OCP package, you could see kfmon, koreader and/or plato and whatever you called the file you used for your NickelMenu configuration.
I unistalled KFMon and removed the kfmon, plato and koreader files since I preferred to launch from within NickelMenu. In my NickelMenu config file, I added the following lines:
Code:
# Launch KOReader directly via NM (>= KOReader 2020.05)
menu_item : main : KOReader : cmd_spawn : quiet : exec /mnt/onboard/.adds/koreader/koreader.sh
menu_item : library : KOReader : cmd_spawn : quiet : exec /mnt/onboard/.adds/koreader/koreader.sh
# Launch Plato directly via NM
menu_item : main : Plato : cmd_spawn : quiet : exec /mnt/onboard/.adds/plato/plato.sh
menu_item : library : Plato : cmd_spawn : quiet : exec /mnt/onboard/.adds/plato/plato.sh
The repeated lines are to have the items show when at the Home and My Books screens.