Q: How do I hide the Design-Menu and make it accessible only for the owner?

A: This is easy to do:
1. In the notecard .MENUITEMS
2. cut out the line “LINKMSG DESIGN | …”
3. and add it to the menu “MENU OPTIONS | OWNER” further down

!. NOT into the “MENU HEIGHT | OWNER” but “MENU OPTIONS | OWNER”!