diff --git a/muxplex/frontend/app.js b/muxplex/frontend/app.js
index 262e09a..3bf8a70 100644
--- a/muxplex/frontend/app.js
+++ b/muxplex/frontend/app.js
@@ -804,6 +804,13 @@ function toggleSidebar() {
 
   var collapseBtn = $('sidebar-collapse-btn');
   if (collapseBtn) collapseBtn.textContent = isOpen ? '\u2039' : '\u203a';
+
+  // Refit xterm.js after the sidebar CSS transition completes (0.25s ease).
+  // 'width' fires on desktop (flex layout); 'transform' fires on mobile (overlay).
+  sidebar.addEventListener('transitionend', function(e) {
+    if (e.propertyName !== 'width' && e.propertyName !== 'transform') return;
+    if (window._refitTerminal) window._refitTerminal();
+  }, { once: true });
 }
 
 /**
diff --git a/muxplex/frontend/terminal.js b/muxplex/frontend/terminal.js
index b73bfd7..fb4a812 100644
--- a/muxplex/frontend/terminal.js
+++ b/muxplex/frontend/terminal.js
@@ -542,6 +542,13 @@ function setTerminalFontSize(size) {
 
 window._setTerminalFontSize = setTerminalFontSize;
 
+// Refit the terminal to its container dimensions.
+// Call after layout changes (e.g. sidebar toggle) that alter available space.
+window._refitTerminal = function() {
+  if (!_fitAddon) return;
+  try { _fitAddon.fit(); } catch (_) {}
+};
+
 // ---------------------------------------------------------------------------
 // Mobile touch scroll — rAF-batched WheelEvent dispatch
 // Mobile devices batch touchmove events irregularly; dispatching one WheelEvent
diff --git a/pyproject.toml b/pyproject.toml
index ee61367..53bb426 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "muxplex"
-version = "0.4.4"
+version = "0.4.5"
 description = "Web-based tmux session dashboard — access all your tmux sessions from any browser"
 readme = "README.md"
 license = { text = "MIT" }
diff --git a/uv.lock b/uv.lock
index 59e2a8e..a6fc4fd 100644
--- a/uv.lock
+++ b/uv.lock
@@ -332,7 +332,7 @@ wheels = [
 
 [[package]]
 name = "muxplex"
-version = "0.4.4"
+version = "0.4.5"
 source = { editable = "." }
 dependencies = [
     { name = "aiofiles" },