The QC button is not shown on some instruments like Omnisphere or Massive X. Looks like there’s an issue with the right part of menu introduced with Cubase 11.
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Having the same problem - Omnisphere and Keyscape. Only the VST3 versions - the VST2 versions do show quick controls.
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Looks like its because of a resize issue - The New MIDI Remote is - #182 by Yvan
Yes, that’s it. I’ve reported this issue to Spectrasonics and NI. Both accepted this and the bug will be fixed in one of the next releases.
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Fixed by Spectrasonics
- VST3: Fixes issue in Cubase where the Camera icon and Quick Controls button were not displayed in Cubase’s plugin header
Just saw a new update from Spectrasonics.
Had the same issue with the VST3.
Thanks for letting us know! 
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