You can custom your screen size when connecting to a TN3270 or TN3270E session. Other types of sessions, such as TN5250 and VT sessions, are not affected by this feature.
From the Terminal Type drop down menu, select TN3270 or TN3270E.
From the Screen Size drop down menu, enter Custom RowXCol.
From the RowXCol field, select a valid RowXCol. A valid RowXCol string is a string with 1-3 digits row number, followed by 0 or more blanks, followed by character “x” or “X”, followed by 0 or more blanks, followed by 1-3 digits column number.
Enter the rest of your connection information.
Click the Connect button.