Cannot change width of section in split layout

    public function form(Form $form): Form
    {
        return $form
            // ->extraAttributes(['max-width' => '100%'])
            ->schema([
                Split::make([
                    Section::make([

                    ])->columns(2),
                    Section::make([

                    ])->grow(false)->extraAttributes(['width'=>'20%']),
                ])->from('sm')
            ])->statePath('data');
    }

The section on the right, is taking too much space and I want to reduce its width, but it doesnt work. Any ideas?
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