That's because you're editing the wrong .py file. The one you need to edit is the one in the sh5.exe\data\Scripts\Menu folder, because that's the one the game is using. If you edit the one in the MODS\NewUIs\data\Scripts\Menu folder, any changes you make won't take effect until you enable the mod the next time.
Just be sure to point your editor to the correct .py file when choosing Open from the editor's menu.
Then, when you have the correct TheDarkWraithUserOptions.py file open, the tab you need to look at is the Ships Journal one, two top options. Change those, save the file and everything will be hunky dory