Table Column Sort/Reorder/Rearrange

[born_naked]

I am a complete newbie to Power BI so this might be a stupid question. 

The gist is this: I have date period columns using the Matrix viz that are out of order. Data is not aggregated in pivot as data was prepared originally for ingestion in another app. Is there a way to set the order of columns in a data viz?

Or barring that, if I were to ingest unprocessed data and pivot and clean it in PowerBI is there a way to then set the order of the columns?

Longer question/more context:

I had for another application/use case used python to create a table that was designed to be pivoted without aggregation--possible with Tableau. Since each pairing is unique, I can pivot with aggregation just using sum or avg and don't have an issue with that. But the columns are quite out of order: 

The columns come from a custom date formatted field. I also have a column with the start date of each period and a column with a numeric value which I had used to sort the columns in other applications. I do not see an obvious option to either manually rearrange the columns or to do so automatically in Power BI. 

Thanks in advance