To use 132 column mode, first define a device type as follows:
Devices\Copy to copy from DEFAULT to DEF132
Devices\Add/Modify to change attributes of DEF132. Make the width 132. Add the following to the end of the Initialization escape sequence:
(You could set the Termination sequence to *27,91,63,51,104 but the software doesn't actually use this when you exit from it, so the terminal emulator will be left in 132-column mode)
Terminals\Add/Modify to change SYSTEM entry so it uses DEF132 device type instead of DEFAULT one.