Left-align the horizontal line that separates footnotes from the body of the score

[Jun Tamura]

Hello,

There is a horizontal line between the footnotes and the body of the score. The 
length seems to be a half of the page width and aligned to the center of the 
page in default. How can I change the length and horizontal position of the 
line?

Quite often footnotes are rather short. In such cases, I think that aligning 
the line to the left margin might make sense.

Thanks in advance for your help.

Jun (he/his/him)