Need afl help to show most recent shape only

I need help to show only the latest/last/most recent Shapes like buy/sell arrow or IDNR7 etc. The idea is to have a cleaner chart so that it doesn't look clattered with shapes. Is there a way to do it? I tried barcount or lastvalue, but for want of expertise I couldn't achieve the desired result. I will be very thanksful for expert's help.