Attributes are all disabled when trying to create new attribute set

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Using 5.7.4.2, and find that when I try to create a new Collection attribute set, all of the attribute checkboxes under 'Add Attributes to Set' are disabled. Is there a way to enable? Am seeing a similar issue when trying to edit an existing set -- all unselected attribute checkboxes are disabled -- only attributes already included within the set are toggleable (these are the attribute sets that were installed as part of the initial 'default content' installation).

 
MrKDilkington replied on at Permalink Best Answer Reply
MrKDilkington
Hi jegra,

I believe that an attribute can only be in one set at a time.

Attributes that are disabled have already been assigned to a set.

If you need to move an attribute from one set to another. First you must uncheck it from the set it is currently in, then assign it to a new set.
jegra replied on at Permalink Reply
Ah, thanks MrK! Wasn't used to the new layout, but looks like this will be much quicker for mass reassignments.