You can then choose if you want to enroll the whole portal or just yourself

Please note not all Beta's allow you to enroll only yourself

You're about to join Trend Lines in the Single Report Viewer beta. You can choose below if we should enrol only you or the entire account.
Enrol entire account (4385489)
Enrol only me (shiran@spitfireinbound.com)
By participating in a beta, I acknowledge and agree to the HubSpot Beta Terms.

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How to enroll in HubSpot Beta updates