Hi there!

Sorry for your issue.

Please use the following code in your custom CSS:

.sp-megamenu-parent .sp-dropdown .sp-dropdown-items .sp-has-child>a:after {
    font-family: 'Font Awesome 5 Free';
    font-weight:600;
}

Note: Path towards custom CSS(Joomla 4): System>Site Templates Styles> Click on your current default template name then choose Template Options. Then find custom CSS within the custom code.

https://prnt.sc/5mBuSRh907N3

https://prnt.sc/ooiq-lkMEXr_

https://prnt.sc/nunlX-f5AhK1

Moreover, Our Helix3 based templates support PHP 7.4 maximum. Hopefully next week we will come with PHP 8.0 support.

Best Regards

??? Moreover, Our Helix3 based templates support PHP 7.4 maximum. Hopefully next week we will come with PHP 8.0 support. My provider will disable php 7.4 and php 8.0 next monday 14th november!