I'm trying to change the hierarchy of some activities and would have like to use the multiple update functionality.

I'm a bit lost now as it seems to have changed layout (on both firefox that I'm generally using and on edge) and requires some information that I'm not sure to be able to set correctly.

I would like only to change the parent activity, but I have to issues:

• I can't see on the selection window the one I would like to have (even if it is on the same project.
• So I'm using the lens to look for it, but after choosing it, it doesn't display
• When executing it refuses the change because it seems that the project is not set.
• But I do not want to change the project

How can I update this set of activities?
(I've migrated on v9.1.1 only yesterday)

Thank you