Your spending history is an accumulation of past decisions. The Spending report makes those decisions visible, so you can choose which ones to keep making, and which ones to change.
The Spending report shows all your spending in your Budget accounts, from the biggest of big picture down to individual categories, and even individual transactions.
In the Totals version of the Spending report, click on the section you want more information on. Click on the specific category in the graph to see a list of transactions that led to that amount.
The sidebar in Spending Totals will update as you drill down into each level, showing you the totals for all visible sections of the graph.
You can also look at the spending in your budget accounts in the Trends view to see how things have been changing over time. To drill down, click on any section. From there, you can drill down to a list of transactions.