A selection frame within the FBD-editor is visible, nothing is selected. What to do?
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Click the primary mouse button over an empty area of the →graphical FBD-editor.
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Select the FBD-elements as listed under "Selecting multiple FBD-elements". If you select the FBD-elements by means of the selection frame, release the mouse button when the mouse pointer is still positioned within the graphical FBD-editor.
Background information: The selection frame might stay visible within Neuron Power Engineer, if you move the mouse pointer quickly outside of the FBD-editor and then you release the mouse button.