diff --git a/Sources/ContentView.swift b/Sources/ContentView.swift
index 4e899f92..b3d2b256 100644
--- a/Sources/ContentView.swift
+++ b/Sources/ContentView.swift
@@ -967,6 +967,16 @@ struct ContentView: View {
         workspaceHandoffFallbackTask?.cancel()
         workspaceHandoffFallbackTask = nil
         let retiring = retiringWorkspaceId
+
+        // Hide terminal portal views for the retiring workspace BEFORE clearing
+        // retiringWorkspaceId. Once cleared, reconcileMountedWorkspaceIds unmounts
+        // the workspace — but dismantleNSView intentionally doesn't hide portal views
+        // (to avoid blackouts during transient bonsplit dismantles). Hiding here
+        // prevents stale portal-hosted terminals from covering browser panes.
+        if let retiring, let workspace = tabManager.tabs.first(where: { $0.id == retiring }) {
+            workspace.hideAllTerminalPortalViews()
+        }
+
         retiringWorkspaceId = nil
         tabManager.completePendingWorkspaceUnfocus(reason: reason)
 #if DEBUG
diff --git a/Sources/GhosttyTerminalView.swift b/Sources/GhosttyTerminalView.swift
index 2507edb7..d1818956 100644
--- a/Sources/GhosttyTerminalView.swift
+++ b/Sources/GhosttyTerminalView.swift
@@ -4089,6 +4089,14 @@ struct GhosttyTerminalView: NSViewRepresentable {
                     coordinator.lastBoundHostId = hostId
                 }
                 TerminalWindowPortalRegistry.synchronizeForAnchor(host)
+            } else {
+                // Bind is deferred until host moves into a window. Update the
+                // existing portal entry's visibleInUI now so that any portal sync
+                // that runs before the deferred bind completes won't hide the view.
+                TerminalWindowPortalRegistry.updateEntryVisibility(
+                    for: hostedView,
+                    visibleInUI: coordinator.desiredIsVisibleInUI
+                )
             }
         }
     }
diff --git a/Sources/TerminalWindowPortal.swift b/Sources/TerminalWindowPortal.swift
index d64cc7b1..3f4e4dd0 100644
--- a/Sources/TerminalWindowPortal.swift
+++ b/Sources/TerminalWindowPortal.swift
@@ -209,6 +209,29 @@ final class WindowTerminalPortal: NSObject {
         }
     }
 
+    /// Hide a portal entry without detaching it. Updates visibleInUI to false and
+    /// sets isHidden = true so subsequent synchronizeHostedView calls keep it hidden.
+    /// Used when a workspace is permanently unmounted (vs. transient bonsplit dismantles).
+    func hideEntry(forHostedId hostedId: ObjectIdentifier) {
+        guard var entry = entriesByHostedId[hostedId] else { return }
+        guard entry.visibleInUI else { return }
+        entry.visibleInUI = false
+        entriesByHostedId[hostedId] = entry
+        entry.hostedView?.isHidden = true
+#if DEBUG
+        dlog("portal.hideEntry hosted=\(portalDebugToken(entry.hostedView)) reason=workspaceUnmount")
+#endif
+    }
+
+    /// Update the visibleInUI flag on an existing entry without rebinding.
+    /// Used when a deferred bind is pending — this ensures synchronizeHostedView
+    /// won't hide a view that updateNSView has already marked as visible.
+    func updateEntryVisibility(forHostedId hostedId: ObjectIdentifier, visibleInUI: Bool) {
+        guard var entry = entriesByHostedId[hostedId] else { return }
+        entry.visibleInUI = visibleInUI
+        entriesByHostedId[hostedId] = entry
+    }
+
     func bind(hostedView: GhosttySurfaceScrollView, to anchorView: NSView, visibleInUI: Bool, zPriority: Int = 0) {
         guard ensureInstalled() else { return }
 
@@ -329,12 +352,17 @@ final class WindowTerminalPortal: NSObject {
             return
         }
         guard let anchorView = entry.anchorView, let window else {
+            // Only hide if the entry is not marked visibleInUI. When a workspace is
+            // remounting, updateNSView sets visibleInUI=true before the deferred bind
+            // provides an anchor — hiding here would race with that and cause a flash.
+            if !entry.visibleInUI {
 #if DEBUG
-            if !hostedView.isHidden {
-                dlog("portal.hidden hosted=\(portalDebugToken(hostedView)) value=1 reason=missingAnchorOrWindow")
-            }
+                if !hostedView.isHidden {
+                    dlog("portal.hidden hosted=\(portalDebugToken(hostedView)) value=1 reason=missingAnchorOrWindow")
+                }
 #endif
-            hostedView.isHidden = true
+                hostedView.isHidden = true
+            }
             return
         }
         guard anchorView.window === window else {
@@ -587,6 +615,23 @@ enum TerminalWindowPortalRegistry {
         portal.synchronizeHostedViewForAnchor(anchorView)
     }
 
+    static func hideHostedView(_ hostedView: GhosttySurfaceScrollView) {
+        let hostedId = ObjectIdentifier(hostedView)
+        guard let windowId = hostedToWindowId[hostedId],
+              let portal = portalsByWindowId[windowId] else { return }
+        portal.hideEntry(forHostedId: hostedId)
+    }
+
+    /// Update the visibleInUI flag on an existing portal entry without rebinding.
+    /// Called when a bind is deferred (host not yet in window) to prevent stale
+    /// portal syncs from hiding a view that is about to become visible.
+    static func updateEntryVisibility(for hostedView: GhosttySurfaceScrollView, visibleInUI: Bool) {
+        let hostedId = ObjectIdentifier(hostedView)
+        guard let windowId = hostedToWindowId[hostedId],
+              let portal = portalsByWindowId[windowId] else { return }
+        portal.updateEntryVisibility(forHostedId: hostedId, visibleInUI: visibleInUI)
+    }
+
     static func viewAtWindowPoint(_ windowPoint: NSPoint, in window: NSWindow) -> NSView? {
         let portal = portal(for: window)
         return portal.viewAtWindowPoint(windowPoint)
diff --git a/Sources/Workspace.swift b/Sources/Workspace.swift
index 9709f541..654cfbf3 100644
--- a/Sources/Workspace.swift
+++ b/Sources/Workspace.swift
@@ -966,6 +966,19 @@ final class Workspace: Identifiable, ObservableObject {
         triggerNotificationFocusFlash(panelId: panelId, requiresSplit: false, shouldFocus: true)
     }
 
+    // MARK: - Portal Lifecycle
+
+    /// Hide all terminal portal views for this workspace.
+    /// Called before the workspace is unmounted to prevent portal-hosted terminal
+    /// views from covering browser panes in the newly selected workspace.
+    func hideAllTerminalPortalViews() {
+        for panel in panels.values {
+            guard let terminal = panel as? TerminalPanel else { continue }
+            terminal.hostedView.setVisibleInUI(false)
+            TerminalWindowPortalRegistry.hideHostedView(terminal.hostedView)
+        }
+    }
+
     // MARK: - Utility
 
     /// Create a new terminal panel (used when replacing the last panel)