We have edit the breadcrumb template for it so if you want to replace it then you can follow the following steps:
Firstly copy sleeky_includes folder in child theme to edit the file because if you use child theme then it will not erase data after theme update, after you copy the folder please follow the following steps to change the icons:
Go to sleeky_includes => Custom_post => breadcrumb.php => Then you can see the code like below:
After you get above code you need to replace to your icon code.
We hope this will be helpful to you, if not then please let us know.