A vertical menu in a sidebar provides access to various Zabbix frontend sections.
The menu is dark blue in the default theme.
A global search box is located below the Zabbix logo.
The menu can be collapsed or hidden completely:
When the menu is collapsed to icons only, a full menu reappears as soon as the mouse cursor is placed upon it. Note that it reappears over page content; to move page content to the right you have to click on the expand button. If the mouse cursor again is placed outside the full menu, the menu will collapse again after two seconds.
You can also make a collapsed menu reappear fully by hitting the Tab key. Hitting the Tab key repeatedly will allow to focus on the next menu element.
Even when the menu is hidden completely, a full menu is just one mouse click away, by clicking on the burger icon. Note that it reappears over page content; to move page content to the right you have to unhide the menu by clicking on the show sidebar button.