Sidechain in Live - disable?

I have a VST2.4 plugin with a single input and output bus, each set up as AudioChannelSet::stereo(). In all hosts apart from Live it loads as a plain old stereo plugin, 2ins/2outs. But in Live it gives me a sidechain option, which is entirely useless. Any ideas how I can disable this?

Screen Shot 2021-04-16 at 11.05.42

[edit] I see this option also appears when I load the Audio Plugin demo…

In the time honoured fashion of answering my own questions - I was able to resolve this by return false from isBusesLayoutSupported()

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