Merge two columns into one?

Hi, I'm new using filament and what I need is simple ( I believe ) I just want to display into one column (full name) two columns from model (firstName and lastName) tried with this but didn't work ... any ideas?
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Solution
what i do is create attribute inside my model
    public function getFullnameAttribute()
    {
        return $this->first_name.' '.$this->last_name;
    }
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