Signals
The Signals dock is used to select which are viewed (and be included in a rendered view), by checking/uncheckng the first Sel column.

Other features include:
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toggle between selecting all or none by clicking the top button (Select all/none)
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you can filter rows by typing a comma-delimited list of channels, which is useful for quickly finding a channel in an EDF with dozens of channels; note that any all/none toggle will only apply to the currently shown signals
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you can apply on-the-fly filtering of signals (via a Butterworth IIR designed primarily for EEG channels); the User option can be defined via a config file.
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PDIM shows the physical dimension (units) from the EDF header
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SR shows the sample rate
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you can specify the order of channels through a channel map, applied when first attaching the EDF