How do I minimize or eliminate the graph in the transaction spending reports?

Got it.

The spending tab is intended as an interactive overview of your spending and there is no way to get rid of the graph, or to print the report either. One nice thing about this display is that if you click on a segment of the graph or an item in the category list to the right of the graph, the listing at the bottom changes to show just the transactions in that category.

For spending details without the graph, you can click the Reports button at the top right of the spending tab and pick All reports > Banking > Transaction. 

If you don't find the spending tab useful, you can always go to View > Tabs to show and de-select it.