====== Filtering activities ======

The Gantt chart provides several tools that allow filtering of the displayed activities.

These filters help focus on a specific part of the schedule and facilitate the analysis of projects containing a large number of activities.

Several types of filters are available:

  * **area** filtering
  * **time-based** filtering
  * advanced filters **based on conditions**

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===== Filter by area =====

{{:en:gantt:2026-03-12_12h07_15.png?600|}}

The **Area** filter allows displaying only the activities associated with a specific project area.

To use this filter:

  - enable the **Area Filter** option
  - select the desired area from the list

Only the activities belonging to this area will then be displayed in the Gantt chart.

This filter is a **quick shortcut** allowing a work area to be isolated without having to configure a more complex filter.

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===== Filter by time period =====

{{:en:gantt:2026-03-12_14h11_53.png?600|}}

Time filtering allows displaying only the activities
present within a given period.

To use this filter:

  - define a **start date**
  - define a **finish date**

Four filtering modes are available:

  * **Start**: displays activities starting after the selected date.
  * **Finish**: displays activities finishing before the selected date.
  * **Between**: displays activities intersecting the selected period.
  * **Strict**: displays only activities fully contained within the selected period.

This filter can be used, for example, to analyse:

  * activities planned during a specific project phase
  * work scheduled during a given period
  * activities in progress at a given date

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===== Advanced filter =====

{{:en:gantt:2026-03-12_14h13_37.png?600|}}

The **advanced filter** allows the creation of custom filters
based on different activity fields.

Filters can be defined using:

  * **duration**
  * **description**
  * **dates**
  * **quantities**
  * or any other project field

Each condition includes:

  * a **field**
  * a **condition** (>, <, =, contains, etc.)
  * a **value**

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==== Combining multiple conditions ====

Conditions can be combined using the operators:

  * **AND**
  * **OR**

This allows the creation of more precise filters.

For example:

  * display activities where **duration is greater than 0**
  * filter activities belonging to **multiple criteria**

The applied conditions are displayed in the lower
part of the window.

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===== Using filters =====

Filters simplify the reading of the schedule
and improve data analysis.

They are particularly useful for:

  * analysing a **specific project zone**
  * studying a **time phase**
  * isolating certain **activity categories**
  * working with **complex schedules**

Filters can be activated or deactivated at any time
to return to the full schedule display.