Please follow this instruction:
1) Go to the block diagram.
2) Right-click on the Boolean which you want to change its color.
3) Create
4) Property Node
5) Color [4]
6) A new box will appear.
7) Right-click on the new box.
😎 choose "Change all to Write"
9) Again, right-click on the new box.
10) choose: Create constant
11) A colored box will appear. You could choose colors for both on and off situations.
Just change the 0,1 numerator in the box so you could choose the on and off colors.
For example, you could choose a dark red color for 0 situations (off mode) and a bright red color for 1 situation (on mode).
12) Please note that you should run the program once to see the changes.
Good luck
