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Preferences are saved per device and apply only to you. Changes take effect immediately, no save button needed. To open your preferences, go to Settings > Preferences in the sidebar.

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Appearance

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Theme

Choose how Arca looks on your device. Options: System (follows your OS setting), Light, or Dark.

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First day of week

Set which day your calendar week starts on. Options: Sunday, Monday, or Saturday. Click Customize to choose which sections and items appear in your sidebar. See Sidebar customization for details.
You can also access sidebar customization by right-clicking any whitespace in the sidebar and choosing Customize sidebar from the context menu.

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Show task counts in lists

When enabled, each list in the sidebar shows the number of open tasks next to its name.

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Tasks

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Default view

Choose how tasks are displayed when you open a list. Options: List or Board.

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Group tasks by

Group tasks in list view by a common field. Options: No grouping, By assignee, By status, or By priority.

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Sort tasks by

Control the default order of tasks in list view. Options: Name, Create date, Due date, or Priority.

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Show completed tasks

When enabled, completed tasks are shown inline alongside active ones. Disable this to hide completed tasks and keep the list focused.

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Privacy

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Usage analytics

When enabled, Arca sends anonymous usage data to help improve the app. No personal data or task content is ever shared.