how can I customise the section's width?

Hello all,
In my forms Section I want to make the width around 75% as I want to create few placeholders on the right side, something like this.

when I tried to change this 'full' value to '1' in this Section class. Thanks in advance. protected function setUp(): void { parent::setUp(); $this->columnSpan('full');} it gives me half width and more then 1 give me full. I want 75% of width for this section like this.
section.jpg
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