====== Layers tab ======

The **Layers** tab allows you to control the display of the different
project layers in the **Time-Location view**.

Layers are used to **organise activities by theme or type of work**.
They help structure the reading of the schedule and make it easier
to filter the displayed information.

{{:en:time_distance:2026-03-12_21h52_04.png?400|}}

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===== Layer organisation =====

Each row corresponds to a **project layer**.

Layers may represent, for example:

  * types of work (earthworks, drainage, railway track…)
  * disciplines
  * work packages
  * representation levels of the project

The table allows several parameters to be managed for each layer.

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===== Display order =====

The **Order** column allows you to modify the position of layers
in the display.

The arrows allow you to move a layer:

  * upward
  * downward

This order influences how activities are displayed in the
Time-Location view when several layers overlap.

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===== Visibility =====

The **Visible** column allows a layer to be shown or hidden
in the view.

When the layer is checked, the associated activities are visible
in the schedule.

When it is unchecked, the activities remain in the project but
**are no longer displayed in the view**.

This makes it possible to:

  * simplify the reading of the schedule
  * hide certain disciplines
  * focus on a specific type of work

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===== Working layer =====

The **Working layer** column allows you to define the active layer.

The working layer corresponds to the default layer in which
**new activities will be created or edited**.

Only one layer can be defined as the working layer at a time.

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===== Select all =====

The **Select all** button allows you to quickly enable or disable
the visibility of all layers.

This option is useful to quickly reset the display of the schedule.