How can one change the column (number of characters) at which the Math Commands editor window uses to wrap lines? For example, when I edit the formula
A = left [ matrix {
1 # 0 # 0 # 0 # 0
##
A_{2,1} # A_{2,2} # A_{2,3} # A_{2,4} # A_{2,5}
}right]"
the Commands window wraps the second row of the matrix at
A_{2,1} # A_{2,2} # A_{2,3} # A_{2,4}
# A_{2,5}
when what I really want to do is to make the window bigger to see the matrix row on one line of text.