I can't change the theme options in real time ...

When I go into Preferences to adjust the theme options, the on-screen preview gets caught in a loop preventing me from seeing the changes in real time.
Also in the header settings I have tried to change the link of the cover youtube video and it does not update, it remains with the first video that I put at the beginning, when I installed the theme.

My Wordpress version is 5.5.1, and the Sidney theme is updated too …
What could be failing?

Previewing is defaulted to WordPress system and there is nothing to do with the theme.

You will see the changes directly on the same screen when the affected settings are appearing in the preview box. If they aren’t accessible due to navigation limitation when previewing, you can visit your page on separate web browser window or tab.

I hope thi reply helps.

Please let us know in a new topic if you have any further questions, or if we can provide you with any other assistance.

Regards,
Kharis
aThemes Support