3. Change Highlight Colors

First open the following file:

[Z]Block Highlighter\data\blockhighlighter\functions\load.mcfunction

Then you will see different color names at the end of the following lines:

Line  3 : team modify blockhighlights0 color red          #Set 0
Line  5 : team modify blockhighlights1 color blue         #Set 1
Line  7 : team modify blockhighlights2 color dark_gray    #Set 2
Line  9 : team modify blockhighlights3 color yellow       #Set 3
Line 11 : team modify blockhighlights4 color aqua         #Set 4
Line 13 : team modify blockhighlights5 color dark_red     #Set 5
Line 15 : team modify blockhighlights6 color gray         #Set 6
Line 17 : team modify blockhighlights7 color green        #Set 7
Line 19 : team modify blockhighlights8 color light_purple #Set 8

Change the colors as you wish. Here are the valid color names:

black
dark_blue
dark_green
dark_aqua
dark_red
dark_purple
gold
gray
dark_gray
blue
green
aqua
red
light_purple
yellow
white

Next reload the world.

Finally, hold a stick called Reset Block Highlighter to apply changes.
Or you can type the command: /function blockhighlighter:reset