How do I use Account Center to keep track of all my clients?

Account Center shows all your clients on one screen:

1. Open Account Center in the menu (it has a Meta tab and a Google tab).
2. Organize accounts with account groups: click New group above the table, give it a name, choose the accounts, and save. Each group becomes a chip you can use to filter the screen.
3. Click With delivery to see only the accounts that spent in the period, and use Search account... to find one by name or ID.
4. Hover over a row and click the crossed-out eye to hide an account you don't want to see (you can bring it back with the Hidden button).
5. Click the Customize card metrics gear to choose the metrics at the top, and use Columns for the table.
6. Track the performance of all accounts without opening them one by one.

There is no filter by niche, category, or team member: grouping works through the groups you create.