My active theme is Neve. I conducted the requested tests both on my live site and in a local MAMP environment to avoid affecting production.
On my local MAMP environment:
I switched temporarily to a default WordPress theme (Twenty Twenty-Four / Twenty Twenty-Five) and the calendar preview worked correctly.
I then tested with Astra, and the issue appeared again.
This suggests the problem may not be limited to Neve specifically.
On my live site:
I deactivated Timetics, cleared the site cache completely, and reactivated the plugin as you suggested but the calendar preview remains broken.
At this point, it does appear to be theme-related. However, changing the theme would be a major structural modification for my website, so I would really like to exhaust all possible solutions before taking that step.
Could you please advise specifically what adjustments I could try while keeping Neve active?
For example:
Are there specific CSS rules I could override?
Are there layout settings that commonly interfere with the calendar rendering?
Is there a way to isolate the calendar styles to prevent theme interference?
