User Manuals : FOXMAN-UN under Linux - User Manual : Graphical User Interfaces : NEM Desktop : NEM Network Browser : Map Icon Text Background
Hitachi Energy
Map Icon Text Background
The background for map icon text is configurable via the nem.conf parameter “mapgui_transparent_symbol_label”. The default value is “false” (non transparent). To switch to transparent set the value to “true”.
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Please note: 
You have to stop/restart the NEM Network Browser in order for the change to take effect.