This button folds all lines: breaks, projects and phases added to the timesheet.
This button is accessible from the timesheet header line on the left.
It is possible that the default display setting is "all folded". This is a setting in the No access : 
Global configuration - âŁ
This button folds all the levels and values of a structure, displaying only the first hierarchical level with a single click.
This button folds all lines: attributes in theexchange
This button allows you to collapse all lines: attributes in the task.
This button allows you to fold all break lines: this corresponds to the report libraries.
This button allows you to collapse all lines: projects and phases.
This button is accessible from the header row of the monitoring , on the left.
This button allows you to collapse all rows: risks and severities.
This button is accessible from the header row of the risk overview screen, on the left.
This button allows you to collapse all lines: projects and phases.
This button is accessible from the header row of the resource summary screen, on the left.
At the top of plan : This button allows you to collapse all lines for all displayed resources: projects and phases. In the plan , at the resource level: This button allows you to collapse all lines for the resource: projects and phases.
This button is accessible from the header row of plan , on the left AND at the resource level using the chevron.