Dear ChimeraX developers and users,
In Chimera, I can use the following commands to redefine the secondary structure info.
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setattr r isHelix false :       
setattr r isSheet false :
setattr r isSheet true :8-12,16-21
setattr r isHelix true :55-61,78-92
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What's the ChimeraX equivalent?

By the way, I can also delete the hydrogen atoms using "delete element.H" in Chimera. Is there an equivalent in ChimeraX?
Many thanks in advance!
Steve
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Steve Chou