zammad/app/assets/stylesheets/print.scss

#app > *:not(.content):not(.active),
#app > .hide {
  display: none;
}

.table {
  border: 1px solid hsl(0,0%,90%);
}

.table thead tr {
  border-bottom: 1px solid hsl(0,0%,90%);
}

/*

  Dashboard
  =========

*/

.dashboard + .sidebar {
  display: none;
}

/*

  Ticket Overviews
  =================

*/

.bulkAction,
.overviews .checkbox-replacement,
.overviews .overview-header,
.table-checkbox {
  display: none;
}

/*

  Ticket Zoom
  ===========

*/

.ticketZoom-controls,
.scrollPageHeader,
.article-new,
.article-actions,
.tabsSidebar,
.attributeBar,
.textBubble-overflowContainer {
  display: none;
}

.tabsSidebar-sidebarSpacer {
  margin-right: 0;
}

.article-meta .article-meta-key {
  display: none;
}