I've made a Rigify skeleton. After I generated a rig some of the control curves were created too small and they are hidden in my character's geometry. I tried to fix 'em in the edit mode, but the curves disappear once I activate the edit mode. So how can I scale up the curves? And also I'd like to change some shapes a bit. So can I do it on one side and have the other side fixed automatically?
In pose mode, select the control bone you want to alter, go to bone properties, viewport display, and use the scale value.
If more than one bone are selected and you press Alt button when validating, the same scale is applied to all selected bones.
You can also edit the shapes, they are nothing but a simple mesh, note that the edit has to be performed orienting the mesh in object mode aligned with the bone, so that the edits are aligned too.