Grafana 6.2.4 : How to save Explore configuration?

Hi all,
Maybe it is as simple as i am blind but i don’t see how save Loki Data Source in Explore.
Each time i log in Grafana and use Explore i have to select the Data Source one more.
Please, could you help ?
Best regards,

Just to add : i connect via CAS and i don’t see the Memory Profile as described in doc