Wrap the text and commands in procedure window

I don't think there is a wrap-text option for procedure windows (I don't know for sure, though). You could instead, for example, adjust the magnification (ctrl & + and ctrl & -) or you could split up you command into several sub-steps. The latter would probably also make the code more readable and easier to debug. Another option would be to write your code in an external editor of your choice (this is what I do). Igor conveniently updates procedures on-the-fly when they are saved by another program.

Thank you for your help. I'll try other options as you suggested. I hope they bring the functionality.

Line continuation is possible for string and numeric expressions

For wrapping comments, see code snippet here.

In most cases rewriting as several commands results in the most readable code.