I replaced the modified player file with the default one, loaded into game to make sure it's working fine then i logout
After that i use the UIBuilder to change the progress bar style to "/progressbarlist.progress_default" instead of the default "/SpecialElements.GreyscaleVitalBar.data.bar.bar_style", and save the file.
I loaded back into the game and this time the health bar disappeared
Changing it back to the default style doesn't help unless i replace the file with the default one.
Is my UIBuilder having some issue ?