Hello,
1/ Please submit request about adding the new icon – https://www.8theme.com/taskboard/
2/ Clear cache and check one more time – https://prnt.sc/z-Xl3vxCRKDw
Temporarily disable cache of Static blocks in Theme Options > Speed optimization.
3/ Yes, there is no such option, unfortunately. https://www.8theme.com/taskboard/
Regards