pane
Use only to refer to the separate areas of a split or single window. For example, in File Explorer, the names of all the folders sometimes appear on one pane and the contents of a selected folder on another pane.
If a pane isn't labeled in the UI, use lowercase for the name that describes it, such as the annotation pane. If a pane is labeled in the UI, follow the capitalization used in the UI. For example, the Score pane.
Use the preposition on when referring to the contents of a pane.
See also Describing interactions with UI, Formatting text in instructions
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