is there any chance to have a setting to remove the line going down?
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Assuming you mean the gridlines, I would like to add an option for that. Although I won't be able to add in in the next update since the settings menu is currently full, so there's not room to put any more settings. I'll need to do an overhaul of it to add them, but that will take a little bit, and I don't want that to delay Ch5 maps.
If you're talking about the notes starting to spawn inside the box, that's a bug caused by lag on lower powered devices. I would obviously like to fix that, but that will take a while, so it also probably won't be in the next update.