As you know there is option at the end of each math to choose if you want more money or xp by sliding the "dot"

But I don't have it, there is no slider like that, mybe it's because i play on lowest graphics?

If you know what's going on let me know

what level are you? If you're lvls 1-3 it doesn't show up. it starts at lvl 4... if you are lvl 4 or higher then there might be an underlying issue