The Composition Tool Tab provides an opportunity to control the layout of a photo. However, this tool is not enabled by default. Crop, rotate, flip, apply keystone corrections, and utilize the Overlay tool when capturing an image for a specific layout or design. Aspect ratios can be applied to images to meet the output format needs.
The Composition Tool Tab is no longer a default Tool Tab. The Tool Tab is blank by default, so you will have to add tools manually. However, the original Composition Tool Tab (complete with tools, as displayed) can be accessed by reinstating the Capture One 9 workspace. In the main menu, go to Window -> Workspace -> Capture One 9.