My Limesurvey version is 3.14.5 and I am using SSL. I have problem with https, it's not working on tutorials section. If I click on "Beginner tour" item then nothing is happening.

If I am using Google Chrome Developer, then it's says following error:

Mixed Content: The page at ' myurl.example.com/index.php/admin/index ' was loaded over HTTPS, but requested an insecure XMLHttpRequest endpoint ' myurl.example.com/index.php/admin/tutorial/sa/servertutorial '. This request has been blocked; the content must be served over HTTPS.
File jquery-3.1.1.min.js:4

and

Uncaught (in promise) {readyState: 0, getResponseHeader: ƒ, getAllResponseHeaders: ƒ, setRequestHeader: ƒ, overrideMimeType: ƒ, …}
File homepagesettings#:1

I have following settings in "Global settings":
"Force https": "Don't force on or off"

In my test site where I am using http, tutorials section works.

Tutorial section is create feature for my new users.

Where could I can search solution to my problem? Is it important to switch "Force https": "On"?

Did you try a different browser like Firefox? Just to check if TLS/SSL strictness of Chrome is detecting something.

You talk about a testsite and other installation? Different LS version or everything the same?

I tried Firefox too. This browser console shows same error. My testsite is on same Limesurvey version in same server only without SSL.

What SSL/TLS certificate is used?

These are information about certificate in my site via Chrome Develeoper Security tool:

Certificate - valid and trusted
The connection to this site is using a valid, trusted server certificate issued by Let's Encrypt Authority X3.

Signature algorithm is sha256RSA

Connection - secure (strong TLS 1.2)
The connection to this site is encrypted and authenticated using TLS 1.2 (a strong protocol), ECDHE_RSA with P-256 (a strong key exchange), and AES_128_GCM (a strong cipher).

Resources - all served securely