Missing parts not working in leoCAD,please help

[momo]

check this documentation page. https://www.leocad.org/docs/library.html

I already checked that page,the example brick 4869.dat in the LDraw official parts library,do I need "Using a Custom Parts Library"?If so,the LeoCAD has  already set the path:




1.The complete.zip file include the 4869.dat



2.The parts path,already include the 4869.dat



I tried set the folder path which included the part dir,





And reopen the LeoCAD, then open the missing part file,still DOES not display,so,is it the LeoACD problem or my steps problem?Please point me,thanks!