Raymarine C140w User Reference Handbook page 22

4. Press the PAGE button repeatedly to toggle between the
available application pages in the page set. Alternatively, use the
appropriate softkey to select the relevant application page.
Selecting an application window
1. When more than one application is displayed at any one time,
the active application window is highlighted with a red border:
2. Press the ACTIVE button to move the red border to another
window on the screen.
3. Press and hold the ACTIVE button to switch the currently
highlighted window to full-screen mode.
4. Press and hold the ACTIVE button to return the screen to
split-window mode.
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C-Series Widescreen user reference