Click a block in the exploded render on the left. The right pane loads an ephemeral copy of just that block, framed on its own centroid.  |  The copy's affine is the parent's with the origin walked forward to the block's first voxel, so both crosshairs report the same MNI mm even though the block is a separate volume with its own voxel indices.  |  Left-drag rotates; the click is only treated as a pick when the pointer did not travel.