Pixela Corporation DCR-TRV340 PIXELA ImageMixer 1.0 Instruction Manual page 148

Click the [Background Color] button to change the current layout's
background color. The color palette will be displayed, allowing you to select a new
background color.
To undo any actions here, set the color to white or create a new layout.
Magnifying or reducing layout display
Click the [Magnify] button to enlarge the layout display by
increments. Click the [Reduce] button to shrink the layout display by
increments.
You can also select a layout display size by clicking the magnification
display window.
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