Import midi file

I make a midi file to sheet music conversion test. I recorded a simply children's song, very well-known in Poland, in such a way that in the left hand there was a simple accompaniment of a waltz style (also jumping through one octave) and in the right hand a melody line. Everything is saved in a midi file in one path on one channel. The unfortunate hand splitting algorithm does not cope with the wide accompaniment in the left hand, and as a result, the lowest note went to the right hand.

In the manual there is information that you can set the sound of the split into a flare yourself - in this piece, indicating C4 would do the trick. However, I do not see such a choice in the program.

Nevertheless, I would like to use the program to transform much more difficult pieces in which different parts are played in different zones of the piano, and indicating one split point will not give an exam.

To sum up, please modify the automatic algorithm for hand split detection to take into account that hands can also jump between octaves and larger intervals. This is often the case in e.g. ragtime styles.
Attached I am sending a midi file which is badly imported.