Regression in 2.1.217: "Last Activity" (activity-days) filter missing when grouping sessions by Project

Summary

After the desktop app auto-updated the bundled claude-code engine from 2.1.209 → 2.1.217 (same day), the "Last Activity" filter (show only projects/sessions active within the last N days) disappeared from the session sidebar when grouping by Project. It is still present when grouping by State.

This is a UI regression — the underlying setting still exists (see below), only the control is no longer exposed in the Project grouping.

Environment

• OS: Windows 11 Pro (26200)
• Claude desktop app (Microsoft Store): 1.24012.1.0
• Bundled claude-code engine: 2.1.217 (regressed) — previously 2.1.209 (worked)
• Both engine versions still cached under %APPDATA%\Claude\claude-code\

Steps to reproduce

1. Open the desktop app with many projects.
2. In the sessions sidebar, set grouping to Project.
3. Look for the "Last Activity" / activity-days filter (e.g. last 3 / 7 days).

Expected

The "Last Activity" (last N days) filter is available in Project grouping, as it was in 2.1.209.

Actual

• In Project grouping the "Last Activity" filter is gone.
• In State grouping it is still present.

Why this matters specifically for Project grouping

This is the core reason to have the filter in the Project view, not a nice-to-have:

• Heavy users accumulate dozens of projects over time (30+ in my case). At any given moment I actively work in only a handful.
• When grouping by Project, the sidebar shows every project I have ever opened, sorted alphabetically/arbitrarily — an enormous list to scroll through.
• The "Last Activity" filter is the only practical way to collapse that list down to just the projects I've touched in the last few days, which is exactly the set I need to navigate between day to day.
• Without it, Project grouping becomes unusable for its main purpose (quickly jumping between the projects I'm currently working on). State grouping is not a substitute — I want to organize by project, not by session state.

In short: the more projects you have, the more essential the activity filter is in Project grouping — and it's precisely the users with many projects who rely on this view.

Evidence the setting still exists

In %APPDATA%\Claude\claude_desktop_config.json → preferences.epitaxyPrefs the keys are still present and populated:

• "code-sessions-activity-days-filter": 3
• "code-sessions-state-activity-days": 3

So the filter state persists; only the Project-grouping UI control was removed/hidden in 2.1.217.

Ask

Restore the "Last Activity" (activity-days) filter control in the Project grouping view.