[help] 如何自定义表单项的宽度（how to customize the form-item's width）

use class and css:

or like this:


Start with the issue title and its CSS/class examples. No repository file, test, or concrete documentation target is identified, so first clarify whether the request needs a how-to document or a code change and define what the completed guidance should cover.

Written by the indexing model from the issue text.