A user interface, UI (108; 200), for a process control system, the UI being configured to be displayed on an electronic visual display unit connectable to the process control system, the UI comprising: a plurality of sub-UIs, each sub-UI being adapted to visually indicate at least a part (101a-101e) of a process controlled by the process control system; and a selection sub-UI, different from each of said plurality of sub-Uls, configured to enable a user to selectively display at least one of the plurality of sub-Uls on the display unit, the selection sub-UI comprising a plurality of visual representations, each of the plurality of visual representations corresponding to one of the plurality of sub-UIs; characterised in that the UI being configured to enable a user to selectively activate and deactivate the selection sub-UI by providing user input to the UI, wherein the selection sub-UI, when activated, is adapted to be at least momentarily displayed on the display unit at least partly superimposed on at least one of the plurality of sub-UIs; the selection sub-UI being adapted to: enable the user to at least temporarily select at least one of the plurality of visual representations by providing user input to the selection sub-UI; on a condition that the user has at least temporarily selected at least one of the plurality of visual representations, re-display the plurality of visual representations on the display unit such that the selected at least one of the plurality of visual representations is positioned within a predetermined region on the selection sub-UI while maintaining the arrangement of the plurality of visual representations relatively to each other as displayed on the display unit; and on a condition that the selection sub-UI has been deactivated, display sub-UI corresponding to the selected at least one of the plurality of visual representations on the display unit. a plurality of sub-UIs, each sub-UI being adapted to visually indicate at least a part (101a-101e) of a process controlled by the process control system; and a selection sub-UI, different from each of said plurality of sub-Uls, configured to enable a user to selectively display at least one of the plurality of sub-Uls on the display unit, the selection sub-UI comprising a plurality of visual representations, each of the plurality of visual representations corresponding to one of the plurality of sub-UIs; characterised in that the UI being configured to enable a user to selectively activate and deactivate the selection sub-UI by providing user input to the UI, wherein the selection sub-UI, when activated, is adapted to be at least momentarily displayed on the display unit at least partly superimposed on at least one of the plurality of sub-UIs; the selection sub-UI being adapted to: enable the user to at least temporarily select at least one of the plurality of visual representations by providing user input to the selection sub-UI; on a condition that the user has at least temporarily selected at least one of the plurality of visual representations, re-display the plurality of visual representations on the display unit such that the selected at least one of the plurality of visual representations is positioned within a predetermined region on the selection sub-UI while maintaining the arrangement of the plurality of visual representations relatively to each other as displayed on the display unit; and on a condition that the selection sub-UI has been deactivated, display sub-UI corresponding to the selected at least one of the plurality of visual representations on the display unit. enable the user to at least temporarily select at least one of the plurality of visual representations by providing user input to the selection sub-UI; on a condition that the user has at least temporarily selected at least one of the plurality of visual representations, re-display the plurality of visual representations on the display unit such that the selected at least one of the plurality of visual representations is positioned within a predetermined region on the selection sub-UI while maintaining the arrangement of the plurality of visual representations relatively to each other as displayed on the display unit; and on a condition that the selection sub-UI has been deactivated, display sub-UI corresponding to the selected at least one of the plurality of visual representations on the display unit.