My traffic light color shown wrong

Anonymous  I will suggest you another way of doing it, you first create a measure that will be used for color coding like below.  You can change or modify the condition as per your requirment.

Color_Code =

if (and([GP% YTD] < .15,[GP% YTD] >= -100), 1,
if(and([GP% YTD] < .4,[GP% YTD] >= 0.15), 2,
if(and([GP% YTD] < 10,[GP% YTD] >= 0.4), 3 ,
4)
)
)

Once you create above measure, you can then use above result in the conditional formatting. Conditional formatting in the matrix will change as per the result of the measure created above.

Anonymous , it should be

Color_Sales = 
VAR _variance_per_country =
[Sales Vari %]
RETURN
SWITCH (
TRUE (),
_variance_per_country < 0  , "red",
_variance_per_country < 0.2 && _variance_per_country >= 0, "green",
_variance_per_country <= 10 && _variance_per_country >=0.2, "yellow",
"#00000"
)

or

Color_Sales = 
VAR _variance_per_country =
[Sales Vari %]
RETURN
SWITCH (
TRUE (),
_variance_per_country < 0  , "red",
_variance_per_country < 0.2 && _variance_per_country >= 0, "yellow",
_variance_per_country <= 10 && _variance_per_country >=0.2, "green",
"#00000"
)

Find the file attached

HI Anonymous 

I'm confused, maybe others are too.

Your initial post showed a measure being created based on the value of [GP% YTD] and the image showed [GP% VARI] being conditionally formatted based on the result of that new measure.

Is this what you want?  To format [GP% VARI]  based on the value of [GP% YTD] ?

Or do you want [GP% VARI] formatted based on it's own value?

Either way you don't need to create a new measure, you can set your conditional formatting rules as I've shown.

FWIW, the final value in the SWTCH statement is missing a 0, the hex colour value should be "#000000"

Regards

Phil