Use the Edit > Select All command or the [Ctrl + A] keyboard shortcut, to select all of the objects in the active document.
Images
Which objects will be selected when you use the Edit > Select All command, depends on which mouse mode is active. You select the active mouse mode by clicking one of the buttons in the Toolbox toolbar.
When you are working in the edit-object mode
When you are working in the edit-object mode, all of the drawing objects in the active image will be selected. You can find more information on working with drawing objects here.
To switch to the edit-object mode, click the Selection Tool 
button on the Toolbox toolbar.
When you are not working in the edit-object mode
When you are working in another mode, e.g. the pan mode, the complete image will be selected. Already existing selections will then be automatically deleted.
You can then, for example, use the Edit > Copy command to copy the image into the clipboard.
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