WordPress/wp-includes/blocks/navigation-link/style.css

.wp-block-navigation .wp-block-navigation-item__label{
  overflow-wrap:break-word;
}
.wp-block-navigation .wp-block-navigation-item__description{
  display:none;
}

.link-ui-tools{
  border-top:1px solid #f0f0f0;
  padding:8px;
}

.link-ui-block-inserter{
  padding-top:8px;
}

.link-ui-block-inserter__back{
  margin-left:8px;
  text-transform:uppercase;
}

.components-popover-pointer-events-trap{
  background-color:initial;
  cursor:pointer;
  inset:0;
  position:fixed;
  z-index:1000000;
}