Many times you may want to work in an unpublished theme so that you can make changes that make take multiple sittings before you go live with them.
Sometimes you can't see the experience inside of Site Builder for the unpublished theme. So what you really need to do is view the unpublished theme page outside of Site Builder
How to get the preview link for an unpublished theme:
1) Go into Edit Code mode on the unpublished theme
2) Click on "Preview" from the three dots menu
3) You will be sent to a preview link for the home page for example it will look like this: https://www.yoursite.com/?ctid=1234
Note the ending of the url - this will be different for your site
If you have your home page redirected to another page, the right click on "Preview" to copy the link. Then you will use the ?ctid=1234
4) Use the ctid=12345 on other pages that support this
Home page: https://www.yoursite.com/?ctid=1234
All Courses page: https://www.yoursite.com/collections/?ctid=1234
A category page: https://www.yoursite.com/collections/collection-name/?ctid=1234
A course page: https://www.yoursite.com/courses/course-name?ctid=1234
Student dashboard: https://www.yoursite.com/enrollments?ctid=1234
Bundle and custom pages do not work using this method.