Hello. After adding the font, try pressing the CTRL key and, without releasing it, press the preview button.

Thank you Aleksej, you are really active on this forum... I know that...

It's my pleasure.

Great... Please send the notification to X5 programers...

I sent a notification about your question to the company employees, expect an answer from them here in the comments.

Great... I'm still waiting...

Good afternoon

We're currently investigating an issue with Fonts in the software's preview, while it should work fine on the UI and the online website

If this is your case, I can confirm that the issue is being verified and solved. I will keep you posted here as soon as news on this becomes available 

Thank you

Stefano

Good afternoon

I would like to inform you that an update is available for testing which addresses your issue, should you be part of the BETA program.

You can read more about it here in case you are not and wish to join:

http://beta.websitex5.com/

If you have the chance to test it out, please leave me a feedback here

Thank you

Stefano

I dont have a time to be your free debuger sorry... I'm running a company so i need a reliable and stable system... Please make it worth...