# Setting: `app_theme_lock`

- **Constant:** `ConfigInterface::APP_THEME_LOCK`
- **Category:** `app`
- **Type:** `select`
- **Required:** yes
- **Sensitive:** no
- **Validation:** `required|string|max:255`
- **Placeholder / default hint:** `false`

## Description

Force the configured theme (light/dark) for all users (disables per-user theme toggle)

## Allowed options

- `true`
- `false`

## Change via CLI

```bash
featherpanel saas getsetting app_theme_lock
featherpanel saas setsetting app_theme_lock "<value>"
```

## Change via API

```http
PATCH /api/admin/settings
Content-Type: application/json

{ "app_theme_lock": "<value>" }
```