help: Document new "Open message feeds at" mobile configuration.

help/configure-where-you-land.md

@@ -0,0 +1,43 @@
+# Configure where you land in message feeds
+
+When you go to a message feed in the Zulip web or desktop app, you'll generally
+land at your oldest unread message in that view.
+[Searches](/help/search-for-messages) and [starred
+messages](/help/star-a-message) put you at the newest message instead.
+
+
+In the mobile app, you can choose where message feeds will open:
+
+* **First unread message**: Recommended if you like to clear your inbox of
+  unread messages.
+* **First unread message in conversation views, newest message elsewhere**: In
+  Zulip, a **conversation** is a [direct message](/help/direct-messages) thread
+  (one-on-one or with a group), or a [topic in a
+  channel](/help/introduction-to-topics). This option works well if you have old
+  unread messages, and don't want to navigate there in your [Combined
+  feed](/help/combined-feed) and [channel feeds](/help/channel-feed).
+* **Newest message**: You may be used to this behavior from other chat
+  applications. To avoid accidentally marking messages as read,
+  consider setting [Mark messages as read on
+  scroll](/help/marking-messages-as-read#configure-whether-messages-are-automatically-marked-as-read)
+  to **Never** when using this setting.
+
+{start_tabs}
+
+{tab|mobile}
+
+1. Tap the **Menu** (<i class="zulip-icon zulip-icon-mobile-menu mobile-help"></i>)
+   tab in the bottom right corner of the app.
+
+1. Tap <i class="zulip-icon zulip-icon-gear mobile-help"></i> **Settings**.
+
+1. Tap **Open message feeds at**.
+
+1. Tap the desired configuration to select it.
+
+{end_tabs}
+
+## Related articles
+
+* [Marking messages as read](/help/marking-messages-as-read)
+* [Reading strategies](/help/reading-strategies)

help/include/sidebar_index.md

@@ -108,6 +108,7 @@
 * [Marking messages as read](/help/marking-messages-as-read)
 * [Marking messages as unread](/help/marking-messages-as-unread)
 * [Configure unread message counters](/help/configure-unread-message-counters)
+* [Configure where you land](/help/configure-where-you-land)
 * [Emoji reactions](/help/emoji-reactions)
 * [View your mentions](/help/view-your-mentions)
 * [Star a message](/help/star-a-message)

help/marking-messages-as-read.md

@@ -133,5 +133,6 @@ channel or topic as read**.
 ## Related articles
 
 * [Marking messages as unread](/help/marking-messages-as-unread)
+* [Configure where you land in message feeds](/help/configure-where-you-land)
 * [Reading strategies](/help/reading-strategies)
 * [Read receipts](/help/read-receipts)