diff --git a/src/terminalService.js b/src/terminalService.js
index bec595b..52e3b7b 100644
--- a/src/terminalService.js
+++ b/src/terminalService.js
@@ -118,10 +118,16 @@ class TerminalService extends EventEmitter {
                 this.ptyProcess.kill();
                 this.ptyProcess = null;
             }
+            this.started = false;
         } catch {
             // ignore
         }
     }
+
+    restart() {
+        try { this.dispose(); } catch {}
+        try { this.start(); } catch {}
+    }
 }
 
 const terminalService = new TerminalService();
diff --git a/src/ui/InkApp.jsx b/src/ui/InkApp.jsx
index e402887..068aca3 100644
--- a/src/ui/InkApp.jsx
+++ b/src/ui/InkApp.jsx
@@ -124,6 +124,8 @@ export default class InkApp extends React.Component {
         this.toggleMenu = this.toggleMenu.bind(this);
         this.onKeypress = this.onKeypress.bind(this);
         this.menuAction = this.menuAction.bind(this);
+        this.getModelSettingsItems = this.getModelSettingsItems.bind(this);
+        this.handleModelSettingAdjust = this.handleModelSettingAdjust.bind(this);
     }
 
     componentDidMount() {
@@ -230,6 +232,8 @@ export default class InkApp extends React.Component {
         const isUp = data.length >= 3 && data[0] === 0x1b && data[1] === 0x5b && data[2] === 0x41;
         const isDown = data.length >= 3 && data[0] === 0x1b && data[1] === 0x5b && data[2] === 0x42;
         const isEnter = data.length === 1 && data[0] === 0x0d;
+        const isLeft = data.length >= 3 && data[0] === 0x1b && data[1] === 0x5b && data[2] === 0x44;
+        const isRight = data.length >= 3 && data[0] === 0x1b && data[1] === 0x5b && data[2] === 0x43;
         const isCtrlC = data.length === 1 && data[0] === 0x03;
 
         if (!this.state.menuOpen) {
@@ -245,7 +249,32 @@ export default class InkApp extends React.Component {
             return;
         }
 
-        // Menu navigation
+        // Submenu: Model settings adjustments
+        if (this.state.menuOpen && this.state.menuMode === 'model') {
+            const items = this.getModelSettingsItems();
+            if (isUp) {
+                this.setState((s) => ({ menuIndex: (s.menuIndex - 1 + items.length) % items.length }));
+                return;
+            }
+            if (isDown) {
+                this.setState((s) => ({ menuIndex: (s.menuIndex + 1) % items.length }));
+                return;
+            }
+            if (isLeft || isRight) {
+                const idx = this.state.menuIndex;
+                const dir = isRight ? 1 : -1;
+                this.handleModelSettingAdjust(items[idx].key, dir);
+                return;
+            }
+            if (isEnter) {
+                // Enter exits model submenu back to main menu
+                this.setState({ menuMode: undefined, menuIndex: 0 });
+                return;
+            }
+            return;
+        }
+
+        // Menu navigation (main menu)
         const items = this.getMenuItems();
         if (isUp) {
             this.setState((s) => ({ menuIndex: (s.menuIndex - 1 + items.length) % items.length }));
@@ -278,12 +307,11 @@ export default class InkApp extends React.Component {
                 try { terminalService.write('\x03'); } catch {}
                 break;
             case 'Restart Terminal':
-                try { terminalService.dispose(); } catch {}
-                try { terminalService.start(); } catch {}
+                try { terminalService.restart(); } catch {}
                 break;
             case 'Model settings':
                 // Toggle a sub-menu state
-                this.setState({ menuMode: 'model' });
+                this.setState({ menuMode: 'model', menuIndex: 0 });
                 break;
             case 'Exit the app':
                 try { process.exit(0); } catch {}
@@ -296,6 +324,30 @@ export default class InkApp extends React.Component {
         }
     }
 
+    getModelSettingsItems() {
+        return [
+            { key: 'model', label: 'Model', options: ['gpt-5', 'gpt-5-mini', 'gpt-5-nano', 'gpt-4.1', 'gpt-4.1-mini', 'gpt-4.1-nano'] },
+            { key: 'reasoningEffort', label: 'Reasoning effort', options: ['minimal', 'low', 'medium', 'high'] },
+            { key: 'outputVerbosity', label: 'Output verbosity', options: ['low', 'medium', 'high'] },
+            { key: 'back', label: 'Back to main menu' }
+        ];
+    }
+
+    handleModelSettingAdjust(key, dir) {
+        if (key === 'back') {
+            this.setState({ menuMode: undefined, menuIndex: 0 });
+            return;
+        }
+        const items = this.getModelSettingsItems();
+        const item = items.find((i) => i.key === key);
+        if (!item || !item.options) return;
+        const currentValue = this.state[key];
+        const idx = item.options.indexOf(currentValue);
+        const nextIdx = ((idx === -1 ? 0 : idx) + dir + item.options.length) % item.options.length;
+        const nextValue = item.options[nextIdx];
+        this.setState({ [key]: nextValue });
+    }
+
     render() {
         const { input, logs, terminal, chainOfThought, llmOutput } = this.state;
         const totalCols = (process && process.stdout && process.stdout.columns) ? process.stdout.columns : 80;
@@ -337,7 +389,7 @@ export default class InkApp extends React.Component {
                         <Pane title="Logging" lines={logsView} maxWidth={paneContentWidth} />
                     </Box>
                 </Box>
-                {this.state.menuOpen && (
+                {this.state.menuOpen && this.state.menuMode !== 'model' && (
                     <Box borderStyle="round" paddingX={1} paddingY={0} marginTop={1} flexDirection="column">
                         <Text color="yellow">Main Menu (Up/Down to navigate, Enter to select)</Text>
                         {menuItems.map((label, i) => (
@@ -345,17 +397,17 @@ export default class InkApp extends React.Component {
                                 {i === selected ? '› ' : '  '}{label}
                             </Text>
                         ))}
-                        {this.state.menuMode === 'model' && (
-                            <Box flexDirection="column" marginTop={1}>
-                                <Text>Model: {this.state.model}</Text>
-                                <Text>Reasoning effort: {this.state.reasoningEffort}</Text>
-                                <Text>Output verbosity: {this.state.outputVerbosity}</Text>
-                                <Text dimColor>
-                                    (Adjustments pending wiring: model list [gpt-5, gpt-5-mini, gpt-5-nano, gpt-4.1, gpt-4.1-mini, gpt-4.1-nano],
-                                    reasoning effort [minimal, low, medium, high], output verbosity [low, medium, high])
-                                </Text>
-                            </Box>
-                        )}
+                    </Box>
+                )}
+                {this.state.menuOpen && this.state.menuMode === 'model' && (
+                    <Box borderStyle="round" paddingX={1} paddingY={0} marginTop={1} flexDirection="column">
+                        <Text color="yellow">Model Settings (Up/Down select, Left/Right change, Enter back)</Text>
+                        {this.getModelSettingsItems().map((item, i) => (
+                            <Text key={item.key || item.label} color={i === selected ? 'cyan' : undefined}>
+                                {i === selected ? '› ' : '  '}
+                                {item.label}{item.options ? `: ${this.state[item.key]}` : ''}
+                            </Text>
+                        ))}
                     </Box>
                 )}
                 <Box marginTop={1}>