Fonts styles are now in arabic??, how can I change back to English ?
You do not say your operating system, language settings or version of LibreOffice. This would help.
Have you changed the language settings? On my system Tools > Options >: Language Settings. Select the USER interface as ENGLISH (USA) for American then make certain that Asian and / or Complex text setting are not selected. Then choose in your document a standard Latin font such as Times, Arial or Liberation.