For administrative users with Custom Training Admin permissions, the Enhanced Course Authoring Tool will be available after clicking Administrative from the dropdown menu.
Open menu in top right (click on your name), click Administrative. The Administrative Tools page will show Custom Training option, click it. Choose what you need to edit or create: Pathways, Custom Modules, or Custom Assessments.
For more details on the enhanced course authoring tool functionality, watch a demo recorded January 25, 2022; approx 45 minutes.