Omron NT20M - Manual (Page 104)

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2. Move the bar cursor to the file for which you want to set the initial
screen, and then press F8 (Initial Screen).
3. Input the screen number of the initial screen, and then press the Enter
Key. (For the NT20M, you can input a screen number from 1 to 250; for
the NT600M, from 1 to 1,000.)
4. When the setting has been completed, a message will be displayed.
Press any key to return to the File Selection Display.
Note The initial screen number setting is made for screen files, so the setting will
not be effective unless a file is sent to the PT after the setting has been
made. To send the file, press F6 (Transmit) from the File Selection Display. If
you do not set a initial screen number, the default setting will be 1 unless the
screen is initialized at the PT, in which case the default setting will be 0.
Setting Initial Screens Section 4-5