hello everyone

i have come across the xard system i am still trying to learn it i have read many posts but i am still a little confused with the big arrows . maybe some of you guys can help me with it. my question is when trading the big arrows trend for the bias they tend to re-calculate while there are making higher highs/ higher lows so which big arrow should i be using for the bias. i will attach a chart below with labels so you can understand better. your help is greatly appreciated thanks