I hope this helps.
if [Score]>100 then "Red" elseif [Score]>1 then "Amber" else "Green" end
Then put this field on color shelf.
And assign respective color.
Colors GAR_SM_9.3.twbx 15.9 KB
Your data has a field on columns which may be causing the difference in behavior between your screenshot and Shin's example.
Try creating a new calculated field with the formula "size()" Place this new calculated field on Size on the Marks card and move the Size slider all the way to the right. Also make sure that the Mark Type is set to Bar.