You can preview a course on the course management page. The Preview button in the upper right corner will open a new page with the course details. This is how your users see your course in User Portal.
To launch it, click the Preview button in the Content Properties area.
Your content will be shown in a new browser window. If a new browser window hasn't opened, make sure it's not blocked by your browser. If it is, allow iSpring Learn to open pop-up windows (add iSpring Learn web site to the exceptions).