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If you want font awesome icons there then please use the following code in your custom CSS:
[class^="icon-"]:before, [class*=" icon-"]:before {
font-family: 'Font Awesome 5 Free';
font-weight: 600 !important;
}
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
Best Regards