WhatsApp is reportedly testing a new feature for Android tablets. It is working on a split view feature for select Android beta testers for tablets. The split screen mode allows users to view the chat list and chat view simultaneously.

source https://www.gadgets360.com/apps/news/whatsapp-split-view-feature-beta-release-tablet-android-2-23-5-9-report-3830911#rss-gadgets-all