[UI feedback] Forced V2 interface destroys productivity for multi-project/multi-agent workflows (20+ sessions)

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Describe the enhancement you want to request

Describe the problem

As of today, the option to switch back to the old GUI is completely gone ("你現在使用的是新版面 先前的版面已無法使用"). This forced update has severely disrupted my daily development workflow.

My Workflow & Pain Points

I manage a heavy, multi-project environment where I run more than 20 sessions simultaneously.

1. AI Agent Delegation Broken: I treat each persistent session as a distinct "AI Employee" assigned to specific tasks. In the old interface, having them constantly visible in the sidebar allowed me to easily orchestrate and delegate tasks across different AI workers.
2. Top Tabs Layout is Unusable: Moving these 20+ sessions into top tags/tabs makes it extremely difficult to track, read, and manage. It creates massive visual clutter.
3. Multi-Project Blindspot: I need to work on multiple projects at the same time. With the new hidden/tabbed UI, I completely lose sight of what is happening in other projects and sessions.

The new interface might look "clean" for casual users, but for power users with 20+ active tasks, it is a massive regression in usability and speed.

Suggested Solution

Please bring back a layout option or a configuration toggle to permanently pin the persistent sessions panel to the sidebar, just like the old interface. Power users need structural visibility, not forced simplicity.