# ACF It is not mandatory to have it installed; you can replace it with another option (e.g., Metabox). However, doing so will result in the loss of some dynamic layouts that rely on these custom fields. The areas affected by ACF include: * **Pages**: Description field + topbar section * **Post category fields**: Category featured image + topbar section * **Product category fields**: Category featured image, description + topbar section --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.brickstheme.com/basics/acf.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.