I am using Power BI Desktop Version: 2.65.5313.701 64-bit (December 2018) and when I try to edit properties of a data source and try to save it, my client is frozen and never saves it.
The same issue has been reported internally before: CRI 98539556.
"You can set Description in the new Modelling View in Desktop which is in preview release. We plan to GA it in March and deprecate the old property pane in Report View. We'll not fix this issue as we are planning to deprecate this pane soon."
Best Regards,Qiuyun Yu