Help me edit this AFL, please

[Respira]

I want to change color , thickness of the Bar chart but I don't know how to do it

_SECTION_BEGIN("Investors-vietnam.com");
BarColor=IIf(C>Ref(C,-1),colorGreen,colorRed);
PlotOHLC( Close,  High,  Low,  Close, "", BarColor, styleBar);
_SECTION_END();

//4-Day-Range Switch
prev=AMA2(C,1,0);
d=IIf(C>Ref(Max(Max(H,Ref(H,-3)),Max(Ref(H,-1),Ref(H,-2))),-1),Min(Min(L,Ref(L,-3)),Min(Ref(L,-1),Ref(L,-2))),
IIf(C<Ref(Min(Min(L,Ref(L,-3)),Min(Ref(L,-1),Ref(L,-2))),-1),Max(Max(H,Ref(H,-3)),Max(Ref(H,-1),Ref(H,-2))),PREV));
a=Cross(Close,d);
b=Cross(d,Close);
state=IIf(BarsSince(a)<BarsSince(b),1,0);
s=state>Ref(state,-1);
ss=state<Ref(state,-1);
sss=state==Ref(state,-1);
col=IIf(state == 1 ,51,IIf(state ==0,4,1));
Plot(C,"",Col,128);

Filter = s OR sss OR sss AND V >= 50000;
AddColumn(C,"close",1.2);
AddColumn( IIf( s, 66,1 ), "buy", formatChar, 1, bkcolor =IIf (s,colorGreen, colorRed ));
AddColumn( IIf( Ss, 83,1 ), "sell", formatChar, 1, bkcolor =IIf (Ss,colorRed, colorGreen ));


_SECTION_BEGIN("");
_N(Title = "{{NAME}} - {{INTERVAL}} {{DATE}}: "+_DEFAULT_NAME()+" : {{OHLCX}} {{VALUES}}"
+"\n"+EncodeColor(colorRed)+
WriteIf(s,"EXIT all Short positions\nif trading long positions, enter long Now-\nOR at the market price on tomorrow's Open with stop="+EncodeColor(4)+WriteVal(L+.75*ATR(5),1.4)+" ,","")+
WriteIf(ss,"Exit all long positions today with a Market On Close (MOC) order\nOR at the market price on tomorrow's Open with stop="+EncodeColor(4)+WriteVal(Ref(H+.75*ATR(5), -1),1.4)+",","")+
WriteIf( sss ,"No trading signals today.","") );

_SECTION_BEGIN("MA 10");
P = ParamField("Price field",-1);
Periods = Param("Periods", 10, 2, 200, 1 );
Plot( MA( P, Periods ), _DEFAULT_NAME(), ParamColor( "Color", colorCycle ), ParamStyle("Style") | styleNoRescale ); 
_SECTION_END();

_SECTION_BEGIN("MA 50");
P = ParamField("Price field",-1);
Periods = Param("Periods", 50, 2, 300, 1 );
Plot( MA( P, Periods ), _DEFAULT_NAME(), ParamColor( "Color", colorCycle ), ParamStyle("Style") | styleNoRescale ); 
_SECTION_END();

[portfoliobuilder]

@Respira
I suggest that you review the appropriate sections of the user guide
https://www.amibroker.com/guide/afl/plotohlc.html

https://www.amibroker.com/guide/afl/plot.html

And an example of changing bar colors and using “thick” bars on the forum,

S&C Magazine Jan 2018 Traders Tips

As Tomasz was very busy and did not create an AmiBroker afl for the current issue of Technical Analysis of Stocks and Commodities "Traders Tips" article, I coded a quick sample for the charting portion and am sure others can improve this and add some trading rules to it. The article was written by Barbara Starr Ph.D. a frequent contributor to the magazine, "The CAM Indicator For Trends And Countertrends" It doesn't look revolutionary but seems to have some potential and its fun to try and code…

with the portion you are most interested in being an example

CAMup = ADX( 10 ) >= Ref( ADX( 10 ), -1 ) AND MACD() > Ref( MACD(), -1 ); // upward market
CAMpb = ADX( 10 ) <= Ref( ADX( 10 ), -1 ) AND MACD() < Ref( MACD(), -1 ); // pullback
CAMdn = ADX( 10 ) >= Ref( ADX( 10 ), -1 ) AND MACD() < Ref( MACD(), -1 ); // down market
CAMct = ADX( 10 ) <= Ref( ADX( 10 ), -1 ) AND MACD() > Ref( MACD(), -1 ); // counter-trend

barCOLOR = IIf( CAMup, colorGreen, IIf( CAMpb, colorGold, IIf( CAMdn, colorRed, colorBlue ) ) );

SetChartOptions( 0, chartShowArrows | chartShowDates );
_N( Title = StrFormat( "{{NAME}} - {{INTERVAL}} {{DATE}} Open %g, Hi %g, Lo %g, Close %g (%.1f%%)", O, H, L, C, SelectedValue( ROC( C, 1 ) ) ) );

PlotOHLC( Open, High, Low, Close, "", barCOLOR, styleBar, Null, Null, 0, 0, 3 ); // thick bars