what is the process of adoption of a new icon created via icon composer? should i remove the existing icon from assets catalog? what about compatibility with older macos versions?

To adopt a new icon created via Icon Composer, you should follow these steps:

1. Design and Export: Start by designing your icon in your preferred design tool, export the layers as SVGs, and import them into Icon Composer. You can then adjust for different appearances and platforms.

2. Save and Integrate: Once you're satisfied with your icon in Icon Composer, save the icon file and drag it into Xcode. In Xcode, choose your icon in the Project Editor. This process is streamlined to ensure your icon adapts to different platforms and appearances.

3. Compatibility: Icons created with Icon Composer are designed to be compatible with previous operating systems. The tool allows you to create flat icons that can be used across different platforms, including older macOS versions.

4. Existing Icons: You do not need to remove existing icons from the assets catalog. The new icon can be added and selected in Xcode, and the system will handle the rest.

For more detailed guidance, you can refer to the session Create icons with Icon Composer (13:16) which covers the delivery process.