Missing Option to Delete All Chat History

As shown in the attached screenshot, the mobile chat history management screen currently provides options to select individual chats for deletion, or to select pre-defined time ranges ("Last Week," "Last Month") for deletion.

However, there is no clear, single option to select and delete all chat history accumulated in the application at once. Users are forced to either select chats one-by-one, or rely on a time-based selection, which may miss older history or require multiple attempts to clear everything. This presents a significant usability and privacy issue.