Define textarea height

Hi,
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How can I define the default height of a textarea ?
Sample: https://www.cynovaljoux.ch/test-user
Field😀emande
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Thanks to help me,
​
Jérôme

I'have set rows to 10.

I try why rows=100 but it's not ok.

I don't understand why ? it's OK in preview, but no in front side.

I guess some CSS in your template CSS file, you will need to override that, try this code in the CSS setting of your form:
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form.ui textarea{height:auto !important;}

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Or in the textarea, enable the HTML attributes behavior and add a new attribute:
name: style
value: height:auto !important;