The group window has <page> for each group member. Each of those <page> tags has it's own lfg button and health bar. You can simply delete the lfg buttons, but the health bar is going to be several components (frame, ticks & progress bar at the least). You'll have to adjust them in each group member's page.
Might want to try using uibuilder. The zip file is in your everquest II directory. Even if you do the actual editing via text editor, ui builder may help you figure out what the item you need to edit is named and how what your playing with will affect the look.
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