The Primary and Secondary Sidebars consists of one or more Views contributed by a View Container. Extensions can contribute Views to an existing View Container (for example, Explorer) or they can contribute an entirely new View Container.
✔️ Do
❌ Don't
Many extensions choose to contribute Views and/or View Containers to the Primary Sidebar given the high visibility it gives content. Use good judgement when adding content here—too much contributed UI can lead to a cluttered experience that can confuse your users.
As the name implies, the Secondary Sidebar is normally considered a auxiliary location for Views. While extensions cannot contribute Views directly to it by default, users can drag Views from the Primary Sidebar or the Panel to customize their layout.
By default, View Containers in the Sidebar with more than one View will feature a single ... icon button in the Sidebar Toolbar to show and hide each View. That looks something like this:
However, if only one View is used, the Sidebar will automatically consolidate the UI to use the Sidebar Toolbar to render all of the actions specific to that View. In place of the ... button, the two actions associated with the 'Notes' View are rendered in its place:
As with other toolbars, be careful to not add too many actions to reduce clutter and confusion. If possible, use an existing product icon paired with a descriptive Command name.
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