Arrange checkbox on one column

How to arrange the following checkbox menu in box in one column.
The box is in the dealer section , search dealer.

Attachment 2222

Thanks

Hello Patrick,

1. you can open file \templates\{your_template}\css\style.css
2. find rows:

Code:

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Only registered members can view the code.

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3. and change 50% to 100%

works perfect, thanks