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

And remove in slides?

And remove in slides?

Here is the code for the slider:

.slider-spbookmark-wrap .article-spbookmark, .slider-spbookmark-wrap .bookmark-text{
    display:none;
}

Best Regards