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The [Edit] Menu

[Delete]
Delete the pictures currently selected in the [Thumbnails] pane. This command can also be used while download is paused to remove from the download queue the pictures currently selected in the [Transfer Queue] pane.
[Select Files]
Select files that meet the criteria specified via the sub-menu.
[Select All]
Select all files.
[Deselect]
Deselect all selected files.