Curious i have this address of script!
but seems no valid! ? (maybe was updated ! )
for V4 to put C:\Users\<username>\AppData\Roaming\moi\startup for PC
and ~/Library/Application Support/Moi/startup for MAC.

This one is no more valid!!!
http://moi3d.com/forum/get_attachment.php?webtag=MOI&hash=bd46ba4056aae65bee86c6bb83086146&filename=SeparateSidePanePalettes.js

But try this one! :)
https://moi3d.com/forum/get_attachment.php?webtag=MOI&hash=fb29c425f9b0f1123b1994f1a0fb2d39&filename=SeparateSidePanePalettes.js