separate_textarea_fields_by_view.php

<?php

public function fields(Request $request)
{
    return [
    
        Textarea::make('Description')
                    ->displayUsing(function($description) {
                        return Str::substr($description, 0, 100) . '....';
                     })->onlyOnIndex(),
                     
        Textarea::make('Description')->hideFromIndex(),
    ];
}