I'm new to rigging, and there is my problem. I followed the course called "The Art Of Effective Rigging In Blender", in the course, there is three bone system in one Armature, deform/target/control.
deform : Directly bind with mesh. target : The target bones of "Copy Transforms" constrain added on deform bones. control: Control the target bones in world space, Where the problem appears.
Problem: I parent the root bone of target bones to one control bone in edit mode, switch pose mode, everything disappeared (include target bones) but the control bones. I followed the course all the way down, and compare the blend file with the blend file in course-files, didn't find any key different till now, I'll keep looking for it... So if there is any solution or advice for this problem, thanks a lot!!