A changeset is similar to a folder comparison: it compares two sets of files. However, for a changeset you don't have two separate folders, but rather two states of one group of files. The most typical scenario is comparing two specific commits of a git repository, see How to open Git changesets.
For a changeset, the common Kaleidoscope document window gains a sidebar on the left.
The toolbar has an extra button on the left to hide or show the sidebar. View > Hide/Show File List from the menubar provides the same functionality.
The area below the toolbar a summary of what is presented below. It shows how many items there are in the changeset, and where it originated from. You also see how many items changed (pen icon), how many were added (plus icon), how many deleted (minus icon), and how many moved to a different location (arrow icon)
The main part of the sidebar is a list of all items that have changed in that changeset. Each item shows a colored icon, indicating the kind of change and the name of the item.
Items feature rich contextual menus, offering functionality such as:
The area at the bottom offer various ways to quickly narrow down the list to what you care about. You may filter files by:
The remaining parts of the window depend on the entry selected in the sidebar. Find more information in Comparing Text and Comparing Image.
There is only one setting specific to the changeset window in Kaleidoscope: the size of the sidebar entries. To change that: