Organization Groups allow you to group your Salesforce orgs so you can work in isolation.
Overview
Let's say that you are a consultant and you are working with multiple clients. You can create a Group per client so that when you are doing work for that client, only the Salesforce orgs associated with that client will show up.
Creating and Managing Groups
If you don't yet have groups, you can get to the groups page by navigating to the home page (click the waffle icon in the navbar) and then click Manage Groups.
If you already have a group created, you will see the group switcher above the Salesforce Org dropdown at the top of the page.
Creating a Group
To create a Group, click the + Create New Group button at the top of the page and choose a name.
The organization page is also a great place to manage all of your Salesforce orgs!
Assigning Salesforce Orgs to a Group
You can move orgs by dragging and dropping them on the desired group or to the Unassigned card.
Choosing a Group
To make a group active, click the Make Active button on the group card. Alternatively, you can use the group switcher at the top of the page to quickly do so.
Deleting a Group
You can delete a group by clicking the dropdown menu and choosing Delete.
Any Salesforce orgs associated with a deleted group will still exist without a group.