Are you trying to adjust the UI that comes up using the chat command or the HUD UI that shows all the time if enabled? Each oner has different settings:
Chat UI:
"UI Location (distance from left 0 - 0.80)": 0.05,
"UI Location (distance from bottom 0.45 - 1.0)": 0.75,
HUD UI:
"HUD Location From Left": 0.01,
"HUD Location From Top": 0.98,
"HUD Width": 0.15,
"HUD Height": 0.30,
"Max Players On HUD": 5,
"HUD Transparency 0.0 - 1.0": 0.25,
"HUD Refresh Rate (seconds)": 60.0,
"HUD Font Size": 10
Make sure the plugin is unloaded before editing the config file, save then reload the plugin after changes are made. If you edit the config while the plugin is still loaded it will not save the changes.