Relation Manager Form - Adjust size/width

Is it possible to adjust Relation Manager Form size? Have a big screen and form modal width is about 50% screen width.

I have tried to use
$form->extraAttributes(['style' => 'width: 100%'])
or add custom class the same way, but neither style or class does not appear at form container div.
Zrzut_ekranu_2025-03-7_o_20.08.50.png
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