On the left side of SingleCase, you have a sidebar where you can easily search all the Cases you have permission to see.
You can search for a Case by its name, number, title, or client or counterparty ID.
Under My Cases, you will find all the files you are assigned to - so either you are playing an active role here, or they are your team's files.
In the Other Cases section, you will find all the files of other teams that are publicly accessible.
Important: You will not see inactive Cases at a glance. They are hidden so they don't clutter up your sidebar. You can find them by locating the Client they belong to and clicking on it.