[FEATURE] [FEATURE] Allow hiding Routines and Customize entries from desktop sidebar

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

The Claude Desktop sidebar permanently displays "Routines" and "Customize" entries at the top. For users who don't use Routines and rarely change Customize settings, these entries add visual noise and cannot be hidden.

Proposed Solution

Add a sidebar visibility setting (right-click context menu or a settings toggle) that lets users show/hide individual sidebar sections — including Routines, Customize, and Pinned.

Alternative Solutions

_No response_

Priority

High - Significant impact on productivity

Feature Category

API and model interactions

Use Case Example

_No response_

Additional Context

Related issues suggest sidebar customization is a recurring request:

#54524 (Routines section management)
#54044 (bulk-manage sidebar sections)
#54517 (Routine visibility toggle)