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There are a few commands that can be used in the Config Menu plugin to configure tabulation:

cmd_ToggleTabUsesSpaces
cmd_ConvertTabsToSpaces
cmd_ConvertSpacesToTabsLeading
cmd_ConvertTabsToSpacesLeading

Is there also such a command to set the tabulation width?

no such command, but can be easily called by plugin.
eg in the Console enter:

ed.set_prop(PROP_TAB_SIZE, 2)
or
ed.set_prop(PROP_TAB_SIZE, 9)

Thanks a lot for your reply!

I plan to add few commands,
https://github.com/Alexey-T/CudaText/issues/3978