search input area

Dear Sir,
I have a few questions and would appreciate your help, please:

(1) after a search result is displayed, can the search input at the “search input area” be cleared so that a new search can be typed in instead of have to backspace the earlier search words?

(2) how to increase the search input box?

Thank you & regards,
Koh, Kah Huat

https://ww.wp.xz.cn/plugins/category-wise-search/