Navigate to Settings → Admin → Admin Settings → License.
Find brief details about allocated and total storage, license type, and license expiry date listed at top You can also see the license summary with details on storage retention period, search retention period, advanced threat analytics, and number of clients, right below.
Further down, listings on client usage such as the client name, and their respective used/allocated storage, Storage Retention, Search Retention, and if they've enabled/disabled Advanced Threat Analytics is listed on a table.
To manage the license of a client and allocate resources,
To extend your trial period for an extra 15 days after your initial trial expiry,
To upgrade your license, purchase more client capacity or Advanced Threat Analytics Add-ons, click on Upgrade, located on the top right corner. You'll be redirected to the Store page, from where you can make your purchases.