If you have a Behance profile associated with the same Adobe ID, the integration will automatically be turned on.
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Default Collection
When starting out with Adobe Portfolio, your Behance pages will import to your default Collection. When you click into Pages in the left-hand panel, you will see your Behance pages (marked with a Be symbol) within your Default Collection.
You can change the default import Collection from the Integrations option in the left-hand toolbar. Click into box and and select your new Default import collection:
Note: this does not move your existing imported pages to the new Collection, only newly created Behance projects will appear in the Collection.