Is any way to change the icon in the lesson thumbnail?
If you want to change the thumbnail for your HubLMS lessons, or set the HubLMS course thumbnail, it's an easy setting in the lesson.
To set the thumbnail images navigate over to the course details layout and select the course module (where the lessons are).
Once in the module editor, scroll to advanced settings and find the thumbnail.
You can change the image or keep it empty and it will bring in your brand colors.
Once you have the thumbnail you want, click or tap apply changes and you're good to go with your custom thumbnail on your HubLMS lesson.