If you want to remove Teacher icon from Course archive page and My courses page then you need to add the CSS attached below to Edwiser RemUI settings > general settings > Custom CSS

1) To Hide Teacher icon from Course Archive page:
.pagelayout-coursecategory #coursesregion .instructor-img {
display:none !important;
}


2) To Hide Teacher icon from My courses page:
.pagelayout-coursecategory #mycoursesregion .instructor-img {
display:none !important;
}