Index: src/wp-admin/includes/class-wp-ms-sites-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-ms-sites-list-table.php	(revision 36560)
+++ src/wp-admin/includes/class-wp-ms-sites-list-table.php	(working copy)
@@ -69,7 +69,12 @@
 
 		$current_site = get_current_site();
 
-		$mode = ( empty( $_REQUEST['mode'] ) ) ? 'list' : $_REQUEST['mode'];
+		if ( ! empty( $_REQUEST['mode'] ) ) {
+			$mode = $_REQUEST['mode'] === 'excerpt' ? 'excerpt' : 'list';
+			set_user_setting ( 'sites_list_mode', $mode );
+		} else {
+			$mode = get_user_setting ( 'sites_list_mode', 'list' );
+		}
 
 		$per_page = $this->get_items_per_page( 'sites_network_per_page' );
 
Index: src/wp-admin/includes/class-wp-ms-users-list-table.php
===================================================================
--- src/wp-admin/includes/class-wp-ms-users-list-table.php	(revision 36560)
+++ src/wp-admin/includes/class-wp-ms-users-list-table.php	(working copy)
@@ -81,7 +81,12 @@
 		if ( isset( $_REQUEST['order'] ) )
 			$args['order'] = $_REQUEST['order'];
 
-		$mode = empty( $_REQUEST['mode'] ) ? 'list' : $_REQUEST['mode'];
+		if ( ! empty( $_REQUEST['mode'] ) ) {
+			$mode = $_REQUEST['mode'] === 'excerpt' ? 'excerpt' : 'list';
+			set_user_setting ( 'network_users_list_mode', $mode );
+		} else {
+			$mode = get_user_setting ( 'network_users_list_mode', 'list' );
+		}
 
 		/** This filter is documented in wp-admin/includes/class-wp-users-list-table.php */
 		$args = apply_filters( 'users_list_table_query_args', $args );