You can't and numerous folks, myself included, have complained about it. If you want to add your complaint to the list you can post a message to the feedback forum and/or go to Company | Contact Us to use their feature suggestion form.
A work around has been developed by ULearnIT--I haven't succeeded in pulling up the thread where a link to his site brought up a full feature artical on the technique, but it involves triggering a script and then pausing it. As long as the script is paused, the auto-sort will be disabled. After the user completes their edits, you have to continue or cancel the paused script.