Cmd+click on session tabs no longer opens sessions in side-by-side panels (Desktop App)

Description

In a recent version of the Claude Code Desktop App, Cmd+clicking multiple session tabs in the sidebar used to open the selected sessions as side-by-side panels in the same window. This was very useful for comparing/working across sessions simultaneously.

This behavior no longer works — Cmd+click now appears to only select a single session at a time, and there seems to be no way to view multiple sessions side-by-side in one window anymore.

Steps to reproduce

1. Open Claude Code Desktop App with multiple sessions in the sidebar
2. Click one session
3. Hold Cmd and click another session tab

Expected

Both (or all selected) sessions open as side-by-side panels in the same window.

Actual

Only the last-clicked session is shown; no split-panel view is opened.

Environment

• Claude Code version: 2.1.140
• Platform: macOS 26.2 (Darwin 25.2.0)
• Surface: Desktop App

Impact

This was a daily workflow for me — viewing two sessions side-by-side made it much easier to coordinate work across related tasks. Losing it has been a real productivity hit.