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Changes made to the network layer edge arrow symbols are not saved unless the arrows are checked to be visible.
Changes to the arrow symbols are only saved if they are checked on to be visible. Otherwise, the symbol will revert back to the default symbol.
To save the arrow symbols for the network layer edges, it is necessary to check on the 'Draw arrow on edges', 'Direct', 'Both', and 'None' checkboxes inside the Arrows dialog box to make the arrows visible.