[chimerax-users] cartoon style setting

Hi, May I ask how I can set the cartoon thick for a specific region of a structure in ChimeraX? For instance, the command "cartoon style #1/A:10-20 thick" plays an effect on the whole #1 molecule, not only affecting the specific region #1/A:10-20. Please let me know what the appropriate command is by any chance. Thanks, Junjie