I hope you are well today and thank you for your question.
I could confirm the issue on your shared site but it is working fine on my test site.
Please make sure you have enabled Titlebar in the theme settings as shown in the attached screenshot.
If it still doesn’t work for you then would you mind if I log in to your site and do some troubleshooting? If this is ok then could you please temporary share me your site log in details privately by adding them in the box having text “Enter your private content here (only you and forum moderators will be able see it)”?