Stack Exchange graduated the test of moving the related questions section in the middle of the secreen.
This section rarely provides actually relevant questions and it serves as a big distraction in most cases.
The userstyle removes it from the middle of the screen by directly hiding it. When Related Questions show in the right panel, the old behaviour is preserved and the section is not hidden.
/* ==UserStyle==
@name Stack Exchange remove related
@description Removes the related section
@namespace https://github.com/PurpleMagick/
@version 1
@author VLAZ
@contributor LunarWatcher
@license MIT
==/UserStyle== */
@-moz-document domain("stackoverflow.com"), domain("superuser.com"), domain("serverfault.com"), domain("askubuntu.com"), domain("stackapps.com"), domain("mathoverflow.net"), domain("stackexchange.com") {
#inline_related_var_a_less, #inline_related_see_more, and #inline_related_see_less {
display: none !important;
}
}