In apps that run in macOS 10.15 and earlier, use only the following system control styles in the toolbar. Use only toolbar-specific system control styles. Toolbars look best and are easiest to understand when they contain elements of the same type. Include image buttons or system controls, but not both.
The purpose of the toolbar is to provide shortcuts to common tasks within the app or current window.
Provide toolbar items for the things people do most often.
