If the Terminal Options dialog box is not displayed, choose Terminal from the Options menu.
Click the 132 Column Switching button in the Keyboard Control section and choose the mode you want:
Disabled (the default) does not change the display when an application switches to 132 columns.
Enabled automatically enlarges the dtterm window to display 132 columns when the application switches to 132 columns.
Click OK at the bottom of the Terminal Options dialog box or press Return to save your selection and exit the window.
To save your selection and retain the window, click Apply.