Worksession - Add Xrefs into Layers

Hello there,
is there a way to permanently move certain files loaded trough worksession into separate folders? I am able to actually move them inside folders in rhino 7 but after saving the worksession, it won’t appear in the folders after opening the file again. Rhino 8 won’t even let me move the inserted folders into my folders within the worksession. Please see the attached screenshot for what i am after.

Thank you,
Jan

Screenshot 2024-05-26 155416