The answer is yes, you can add compact buttons to custom toolbars.  Note that it is a section attribute, not a button attribute.  So all of the buttons in a section will be compact. While I am surprised you didn't find the compact attribute on the main branch, you should ignore the main branch.  We branch from develop to make releases.     -- Greg On 9/10/2026 10:52 PM, Alpay S via ChimeraX-users wrote:

Dear ChimeraX developers,

Is it possible to add compact buttons to custom toolbars like this in main ChimeraX? I can only create full size buttons like the ones in the "Lighting & Effects" section. I saw |compact| as a provider attribute only on the development branch but not in the main branch.

Regards

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