This article explains how to create a Default App by Group & Device Grouping in EloView 4

EloView allows you to efficiently manage your devices by organizing them into groups using the drag-and-drop feature. To manage a group's devices, simply click on the desired group to access its device view. You can easily locate and manage devices by using the "Sort by Name" and "Sort by Group" options at the top of the screen. Devices that are not assigned to any group will appear at the bottom of the list under "Ungrouped Devices." The search bar at the top of the Devices page enables users to quickly search through their list of devices.

Group Settings
To modify a group's settings, select the settings icon. Group settings can be edited through the Group Settings page, and any changes made will apply to all devices within the group. To remove a group, click "Delete Group," where you have the option to either delete the group alone or delete both the group and its associated devices.

Group Content
Managing group content is simple. By dragging content to the group's "Now Playing" section, you can set the default content for that group.