To switch to a different company, click on your company name and logo in the top left of your app. If you are a user on 5+ companies, click All companies -> to see those not in view. It might be helpful to note that accounts created by mistake will show as an expired trial after two weeks time.
Notice that you also see dashboards and data rooms shared with your here.
See screenshot below
Click on your company name or All companies ->
Select the company you wish to open
Let us know if you have any questions. We are happy to help.