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cols

cols

Type: integer
Path: $GLOBALS['TCA'][$table]['columns'][$field]['config']
Scope: Display

RenderType: textTable, default

Abstract value for the width of the <textarea> field. To set the textarea to the full width of the form area, use the value 50. Default is 30.

Does not apply to RTE fields.

A simple text editor with 20 width

EXT:styleguide/Configuration/TCA/tx_styleguide_elements_basic.php

[
    'columns' => [
        'text_4' => [
            'exclude' => 1,
            'label' => 'text_4',
            'description' => 'cols=20, rows=2',
            'config' => [
                'type' => 'text',
                'cols' => 20,
                'rows' => 2,
            ],
        ],
    ],
]