Hi there!
Thanks for your query.
From where do you want to remove actually? The following code in the custom CSS will remove the bookmark icon from these spaces: https://prnt.sc/pjm10a0cevAW
.article-spbookmark {
display: none;
}
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