You can change the Time in Force for your order by simply clicking the Time in Force drop down menu. This will expand and allow you to select a new Time in Force. If you wish to set a new Time in Force default, click the Edit menu option followed by Global Configuration. On the left side, click Presets. The first section will be Timing, and you can choose the Time in Force you want from the Time in Force drop down. Once you are finished click Apply and OK.
Find more information about the available time in force options in the TWS Users’ Guide.