In Salesforce, Objects store the field definitions and records that make up your data. As your organization data may contain many objects, you will likely only use a subset of those within Work-Relay. For this reason, you'll want to indicate which objects in your org are available to Work-Relay.

Navigate to Settings > Object Settings (1). Add necessary Objects form "All" list (2) to "Allowed" (3) using button (4):

Click Save.

You can reverse the process to move items no longer needed in Work-Relay out of the Allowed Objects list.

If you need some other Object for your needs, you can create your own.