How do we delete "■" from next to our thumbnails?

Per CSS in the style.css of your theme.

Not very helpful if you have a theme that used the disc elsewhere for a

• element.

I resolved this by editing the plugin (go to Plugins, then Editor, then selecting the plugin), in particular widget.php and changing line 6 to:
<li style=”list-style:none;”<?php if ( is_sticky() ) { ?> class=”rpwwt-sticky”<?php } ?>>“><?php

Hope this helps!

Every change in the plugin’s files will be overwritten by future upgrades. You better edit the style.css of the theme or child-theme.

If you do not want to touch the style.css I recommend to use a plugin like “Best Custom CSS” and add the CSS code there.