Final answer:
The Design tab in Microsoft Excel contains commands for applying predefined chart layouts, including elements arrangement and color scheme.
Step-by-step explanation:
The tab that contains commands to apply a predefined chart layout that controls which elements are included, their arrangement, and their color scheme in Microsoft Excel is the Design tab. When you create a chart in Excel, selecting the Design tab will present you with various chart layout styles that you can apply to your chart with a single click. Each of these predefined layouts can automatically adjust the chart's elements, such as titles, labels, and colors, to suit the selected style.