If the nodes are all on the same ridge you can tick the "Apply to all" check box and all nodes on that ridge will change.
Otherwise you can only change one node at a time.
The pet palette should remember the last operation (i.e. z height) used - so long as you don't press cancel.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11