Hi Meinan,
It looks like the cartoon style “arrowScale” factor was changed to a large value, maybe by an accidental command?  You could try this command to put it back to the default value:

cartoon style arrowScale 2

<http://rbvi.ucsf.edu/chimerax/docs/user/commands/cartoon.html#style>

I hope this helps,
Elaine
-----
Elaine C. Meng, Ph.D.
UCSF Chimera(X) team
Department of Pharmaceutical Chemistry
University of California, San Francisco

> On Oct 12, 2019, at 1:44 PM, Meinan Lyu <mxl1032@case.edu> wrote:
>
> Dear Dr.,
>
> The attached is a picture I saved which the stands' arrows are so wide when using chimeraX to draw some figures, could you please tell me how to make it normal?
> The problem showed after I put into these two command(not quite sure yet):1. zone #3:Lig residueDistance 5 label false  2. cartoon #3/b suppressBackboneDisplay true.
> Thank you very much！
>
> Best regards,
> Meinan
> CWRU
>
> <fig3-aroudresi-ery.tif>