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The shared directory picker is used from right-aligned controls such as the MCP target project selector. Its portal menu previously used the trigger's raw left coordinate, so a trigger near the window edge could render the 400px menu partly off-screen. Clamp the fixed-position menu against the viewport while preserving the existing width where space allows, and cover the right-edge case with a focused component test. Constraint: DirectoryPicker is shared by MCP settings, task prompts, adapter settings, and launch controls. Rejected: Special-case the MCP form layout | the overflow comes from the shared portal positioning and would remain in other right-aligned uses. Confidence: high Scope-risk: narrow Tested: cd desktop && bun run test -- src/components/shared/DirectoryPicker.test.tsx Tested: bun run check:desktop Not-tested: Manual browser smoke; local agent-browser automation hung during startup/command evaluation.