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You can select to enable which feature on the board, Timeline and WBS Gantt both can be available together but to avoid confusion we recommend using only 1 on your board.
WBS Gantt
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Tool
Menu
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Full-screen mode: click on the button to maximize the Timeline view to full screen
Today button: click on it to move the timeline focus to the current day.
View mode: you can select Weeks, Months or Quarters view
Refresh: retrieve the latest data and update the timeline in case you don’t want to refresh the whole page
View settings: customize the display of the timeline