Texas Instruments TI-89 Titanium User Manual page 61

Press Result
D B
4
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If you set Split 1 App and Split 2 App to the same nongraphing App or to the same
graphing App with Number of Graphs set to 1, the TI-89 Titanium exits split-screen mode
and displays the App in full-screen mode.
Selecting the active App
In split-screen mode, only one App can be active at a time.
Getting Started 58