Hi there!
Sorry for your experience with Floox.
Please take my apology, the template got Joomla 4 compatibility but not the PHP 8 compatibility yet. You are using PHP 8 there. Would you please use PHP 7.4 for now, clear your Joomla and browser cache then check again?
Here is our plan about PHP compatibility: https://www.joomshaper.com/blog/latest-php-compatibility-for-templates-and-extensions
And we are on the way of bringing the plan live. Here you will see some blogs about it:
https://www.joomshaper.com/blog/releases-updates
Best Regards