Most charts need just one thing from you: which work items to look at, as a project or a saved filter. Two ask for a little more. The "When" forecast needs a second source for the open work, and Work Item Age needs your workflow stages in order. Everything else has a sensible default, from the time window to the percentile lines. You change it when you want to, not before the first chart appears.
Looking at several teams? Point a chart at a saved filter that covers them all, and it shows their work as one combined picture. Prefer each team on its own? Give each one its own chart.
Why so little to set up? Because the decisions that usually take the longest are already made. Here's which ones, and why.