Only objects will engage the wides. If you were to pan something in a circular pattern within the bed, the sound would travel from the sides to the fronts and ignore the wides.
A good example of this is in “Won’t Get Fooled Again” from
Who’s Next - the synthesizer intermittently moves around all seven floor channels, but the wides only feature some dry lead vocal.
In Pro-Tools, if I set my object panner’s F/R dial to 68% (with no height) the sound comes exclusively from the wide speakers.
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https://immersiveaudioalbum.com/dolby-atmos-faq-background-setup-mixing-tips/