[BUG] mark-all does NOT mark all - and there is no way to save/export chat threads from Claude windows app

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

I'm in the "</>Code" tab on the desktop Claude app.
Ctrl-A/Ctrl-C does not capture my entire chat - there's some kind of lazy-load or unwanted offload of my chat taking place (I can only copy the end - missing the start; or if I scroll to the start, it misses the end, or if I scroll to the middle, I miss both the start and the end)...

Right-click on the thread: has no way to export or save it.
The "Copy-Message" icon only copies the last message
The File menu only has "new" and "open" - no "save"
Every other control I can find - no way to save my entire thread.

What Should Happen?

The totally unnecessary "feature" that blocks us scrolling back and keeping our chat in-memory really needs to be removed - the difference between a very long and rich conversation, and a new one, on the average PC is basically always going to be less than 1% of available RAM - messing up everyone's day with crazy paging logic which blocks copy/paste from working is entirely unnecessary!

Error Messages/Logs

Steps to Reproduce

Find any long chat
select-all/copy
notice you didn't get it all

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.4758.0 (fb266c) 2026-04-24T20:22:30.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_