Thank you for your post!
I believe the function that you are looking for is our MAP Stylesheet Themes. You can set this for the layer, and either manually generates rules for the respective attribute, or you can bulk set these rules based on an attribute where you can use gradient or individual colours for the respective values.
For more details on MAP Stylesheet Themes please see our help article here – https://support.avenza.com/hc/en-us/articles/360044083151-Stylesheet-Themes
If you have any other questions or problems please reach out to us via the form at the top of that link and we’d be happy to help further!