UNLINK does not work to convert particles into new/original meshes I am converting a particle system (based on a collection of meshes) into new meshes. 

The 'new' meshes stay connected (as I can see in EDIT mode) to the original one. Setting every single mesh to an 'original' mesh in the object tab takes a lot of time. 

This question... Problem with particles, converted into mesh objects
...seems to be the same, but the answer which is UNLINK(ING) the object(s) by pressing 'U' makes everything disappear as if I am hitting a delete button instead of 'unlink'.

Does anybody know what I am doing wrong?
I found the answer on this page: Can not find unlink object data in Blender 2.8

In Short: Go to Object Menu --> Relations --> Make Single User.

'Unlink' doesn't seem to work anymore in Blender 2.8. Things disappear when I unlink.