How do I switch off the ambient noise of the virtual environment?

When I start Horizon OS on my Meta Quest 2, I hear ambient noise associated with the chosen Skybox. Depending on choice, birdsong, city traffic or whatever. However, when using PWAs (like Netflix) or certain apps (like Apollo for video game streaming), these background noises continue. If I select the (very ugly) soundbox ‘Bubbles’, I have complete silence. Does anyone know of a way to simply switch off the ambient noise of the virtual environment completely?

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