No sure if this is the place for suggestions.
About movements tree, I think could be better to have it vertical instead hotizontal. Is not too much comfortable to navigate between movements. You can modify heigth but is not usefull with movements on horizontal, and you can’t change the width. I think is better to let the movements go down, and open trees to the right, width will be enough for almost all cases and just this weird situations you can scroll right if needed, and you can resize height to have more movements in sight to come back from a long variation or whathever.
Regards.