I did indeed.
However, attributes are different from the 2 basic categories...
Or I don't know how to manage them.
My world has no gender, but 2 categories are important:
can be red or blue only (non exclusive - character can be one or both or none)
can be bird or bug only (exclusive)
When I create a character, after the database is setup, gender should be replaced by my 2 attributes, and left pane should let me find them (list character by color, and species) and forget about gender.
Current attributes looks like more a criteria (being red) rather than being in a category "color" with value "red".
In that sense, being "male" or "female" would not be part of "gender", but just a name (it is different in current version, gender can include different values, but a new category "color" cannot be created with the 2 possible values "red" and "blue").
Maybe I missed something, I did not play enough with the software