There is the capability to turn off bounding boxes for all objects and for some shaders, and all shaders should have their bounding boxes invisible when the node itself is disabled (just verified with Heightfield Generate and SSS). But yes, it would be good to be able to fully disable bounding boxes, and/or selectively disable them on a per-node basis for *all* nodes that show bounding boxes in the preview. For objects, go to the Objects layout and check out the gear icon on the left under the Node List, you can hide all bounding boxes *for objects* there.
- Oshyan