Thank you for the clarification; I have changed it as you said.
However, under the /Bin64 folder, I found another preferences.xml file, with different information, including this :
<port_preset> ocean </port_preset>
<i_dont_like_premium_port> true </i_dont_like_premium_port>
<i_dont_like_twitch_port> false </i_dont_like_twitch_port>
<i_dont_like_azurlane_port> true </i_dont_like_azurlane_port>
<i_dont_like_arc_port> false </i_dont_like_arc_port>
<port_preset_custom> Black_Hole </port_preset_custom>
My question is: Should I remove <port_preset_custom> Black_Hole </port_preset_custom> from that file, or is your orphan tag solution designed only to empty the value of port_preset_custom before the client tries to set it to the user's port choice?
The reason I ask is that I'm wondering whether I need to search my computers for any other prefrences.xml files tied to WoWS installations (Public Test, for example) and remove the custom port line from them all.