The viewer always displays the “Reset Camera Pose” button. However, for better visual integration of 3D models on websites, it is sometimes preferable to have no UI controls visible on the screen.
You may tune the Viewer UI as you like, according to the docs - Babylon.js docs
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Yes, I hadn’t thought of that, thank you!
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Welcome aboard @mary564 ! 
Unfortunatelly, your answer is a duplicate of this one—answered by @labris 3 days in advance of you 
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Welcome aboard @julien_i !
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