For Newer version of Edwiser RemUI theme (It will work for version Edwiser RemUI 3.7.5 and above)

1) To remove My courses link from the Left Sidebar
Add this CSS in Edwiser RemUI General settings >> Custom CSS section:


#nav-drawer-container a[data-key="mycourses"] {
display: none;
}

__________________________________________________________________

2) To remove Course archive link from the button part of the Left Navigation

Navigate to Site adminstration >> Appearance >> Additional HTML >> Before BODY is closed
Add this code here:

<script>
document.querySelector(".site-menubar-footer a .fa-archive").parentElement.style.setProperty("display", "none", "important");
</script>

Now navigate to Edwiser RemUI general settings >> Custom CSS section:

.site-menubar-footer {
height: 75px;
background-color: #21292e;
}


______________________________________________________________________________________________________________

For Older version of Edwiser RemUI theme (It will work for versions till Edwiser RemUI 3.5.11, Edwiser RemUI 3.6.7 and Edwiser RemUI 3.7.4)

1) To remove My courses link from the Left Sidebar
Add this CSS in Edwiser RemUI General settings >> Custom CSS section:


.site-menubar a[data-key="mycourses"] {
display: none;
}

__________________________________________________________________

2) To remove Course archive link from the button part of the Left Navigation

Navigate to Site adminstration >> Appearance >> Additional HTML >> Before BODY is closed
Add this code here:

<script>
document.querySelector(".site-menubar-footer a .fa-archive").parentElement.style.display="none";
</script>

Now navigate to Edwiser RemUI general settings >> Custom CSS section:

.site-menubar-unfold .site-menubar-footer .col-3 {
width: 33.33% !important;
max-width: 33.33% !important;
}
.site-menubar-unfold .site-menubar-footer .w-p50 {
width: 100% !important;
max-width: 100% !important;
}