Hello!
I have a similar problem. https://archive.joomshaper.com/forums/sp-kindergarten-plugin-course-detail-page-is-not-working-when-i-switch-on-seo-friendly-urls
I activated, created a menu for courses, but I get a 404 error. How can I solve the problem?
Now i have:
Joomla 3.10.11
PHP 5.6
SP Page Builder Pro 3.6.2
SP Kindergarten Administrator Component 2.2
shaper_kidzy Site Template 2.1