Enable large datasets
Steps here describe enabling large datasets for a new model published to the service. For existing datasets, only step 3 is necessary.
Create a model in Power BI Desktop. If your dataset will become larger and progressively consume more memory, be sure to configure Incremental refresh.
Publish the model as a dataset to the service.
In the service > dataset > Settings, expand Large dataset storage format, set the slider to On, and then select Apply.
Enable large dataset slider
Invoke a refresh to load historical data based on the incremental refresh policy. The first refresh could take a while to load the history. Subsequent refreshes should be faster, depending on your incremental refresh policy.