Replicate an Excel connection to an SSAS cube in Power BI Desktop

I have an Excel report that uses an SSAS cube as its data source, and it is painfully slow. I'd like to move it to PBI desktop to get better performance, but I'm not sure exactly how to replicate the connection query to ensure that I'm getting all of the necessary data.

Here's the Excel connection string:

Provider=MSOLAP.7;Integrated Security=SSPI;Persist Security Info=True;User ID="";Initial Catalog=<SSASDatabaseName>;Data Source=<SSASServerName>;Location=<SSASServerName>;MDX Compatibility=1;Safety Options=2;MDX Missing Member Mode=Error;Update Isolation Level=2

The connection type is Cube, and the Command Text is <CubeName>.

I'm able to connect to the server and the cube without any problem, but I'm not sure what to select to get the same data that's being pulled into Excel. When I get to the selection window, however, I'm unclear on what I should be selecting - the dimensions? The measures? Both?

If I use Import, I get this:

Again, I'm not sure which components I should be selecting to emulate the Excel connection query.

If I use Live Query, I get this, which seems like it's connecting to the entire cube - all dimensions, all measures, etc., etc., etc.

Does anyone have any insight regarding which option is best for recreating the Excel query?

Thanks.