Texas Instruments TI-83 PLUS - Manual (Page 252)

TI-83 Plus Split Screen 249
Some screens are never displayed as split screens. For example, if you
press
z in Horiz or G . T mode, the mode screen is displayed as a full
screen. If you then press a key that displays either half of a split screen,
such as
r , the split screen returns.
When you press a key or key combination in either Horiz or G . T mode,
the cursor is placed in the half of the display for which that key applies.
For example, if you press
r , the cursor is placed in the half in which
the graph is displayed. If you press y 0 , the cursor is placed in the
half in which the table is displayed.
The TI-83 Plus will remain in split-screen mode until you change back to
Full screen mode.