Putting in the connection string when connecting to a source like OLEDB, more specifically SQL Server, has always seemed finicky but now with Workbench 5 I'm having an even more hard time. 

I put it in as the whole string at once, it fills in the fields on it's own such as Catalog = , Data Source = , Username =, etc. I hit apply on the window the pops up when you click in the connection (shown in blue in screenshot). This populates all those things in the OLAP Connection box, ok so everything seems fine. I click Apply to the whole thing (the one in red) and click preview. I then get an error saying [02.07.19 1:25:36 PM] The ConnectionString property has not been initialized. I go back to the connection string settings and it's all gone, like I never put it in? What am I missing?