You placed an Irrigation Schedule in your drawing, and it came out too wide.
You can control the width of the Irrigation Schedule by using the USERR2 command. In a drawing where this variable is set to 20.0, the schedule will render with the schedule up to 20 inches wide. Simply type USERR2 in the Command line.
Change the value to 0 to reset it to the default of about 4.5 inches. You can also adjust this setting as necessary.