[chimerax-users] some question about the use of chimera x 1.4

Dear developers, Sorry to bother you. Recently, I notice that chimera x display the DNA/RNA in a different way from that in chimera, and I find that there is a option in chimera called ribbon spline containing two options:B-spline and cardinal which explain why DNA/RNA is displayed in different ways in two softwares. However, I can not find the related actions in chimera x: "ribbon spline" in chimera refers to what in chimera x and how can I adjust this parameter. Sincerely, Chongzhao You