That's will easy; Open the file "...\Customized\Views\HUD\CharPortraitRight.xml"

If you have the last version (1.13), you will get, at line 55 to 65, buffs opponents options.

		
		<BuffListView name="BuffListView"
					  h_local_alignment="CENTER"
					  layout_borders="Rect(0,0,0,0)"
					  icon_size="Point(26,26)"
					  icon_spacing="Point(2,0)"
					  full_size_limit="30"
					  max_columns="15"
					  filter="hostile"
		/>
		

filter="hostile"

Change the line to:

filter="hostile,friendly"

Voila! Don't forget to save and if your game is still open, you can do "/reloadui" to see the last changes.

PS: I remove "friendly" target buffs because we get too much icons, you can change 'max_columns=""' and 'full_size_limit=""' too get a better display.