What feature in PowerPoint is used to apply a visual change to backgrounds?

The feature in PowerPoint that allows you to apply a visual change to backgrounds is found in the Format Background options located in the Design Ribbon Tab. This area provides comprehensive choices for modifying the appearance of your slide backgrounds, such as solid fills, gradient fills, textures, patterns, and inserting images. By accessing these options, users can create visually appealing presentations with customized backgrounds that enhance the overall design and make content stand out effectively.

The other choices relate to different aspects of PowerPoint functionality. Theme settings in the View Tab offer predefined design styles that can be applied to the entire presentation but do not allow detailed background modifications on a slide-by-slide basis. Master Slide tools in the Slide Layout settings allow for broader layout adjustments and content placements but focus more on maintaining consistency across slides rather than the specific application of visual changes to backgrounds. Transitions effects in the Animations Tab pertain to how slides move from one to another during the presentation, which does not influence the design of the slide backgrounds themselves.