Throughout the platform, when selecting the search engine you wish to view data across via multi-domain widgets, you may see options such as Primary Engine, Primary Google Mobile, Google & Google Mobile. Depending on the provisioning of a profile, these options may have significant differences. The Primary Engine options will be the default search engines seen in Rank Intelligence for a domain profile. As an example, the Primary Engine could be Google Desktop, Google Mobile, Baidu Desktop, Baidu Mobile, etc.
For more information on Multi-Domain dashboard widgets: https://kb.seoclarity.net/portal/en/kb/articles/multi-domain-dashboard