App 端操作路径：App 首页左上角【九宫格/Menu】-点击头像【账户设置/Account Settings】-【偏好设置】-【主题模式】，然后您可以选择【跟随系统】、【日间模式】或【夜间模式】以调整APP的背景色。 网页端操作路径：在现货交易页面右上角找到设置图标，点击设置-【界面设置】-修改【主题模式】。2、如何切换系统语言? App 端操作路径：App 首页点击左上角【九宫格/Menu】 - 点击头像【账户设置/Account Settings】 - 【偏好设置/Preferences】 - 【语言/Language】。 网页端操作路径：在网页右上角，点击最右侧【地球图标】 - 【语言/Language】。3、如何切换计价货币？ App 端操作路径：App 首页点击左上角【九宫格】-【账户设置】-【偏好设置】-【计价货币】，您可以选择不同的计价货币，如美元、人民币、欧元等。 网页端操作路径：页面右上方点击【头像】-【偏好设置】-【货币】，您可以选择不同的计价货币，如美元、人民币、欧元等。

十四、接口报错：51010 Request unsupported under current account mode 这个跟您的账户模式有关系，如果您要下单现货杠杆或合约，需要调整为除现货模式外的其他3种模式！您可以通过接口：https://www.okx.com/docs-v5/zh/#trading-account-rest-api-set-position-mode 设置，也可以在网页或 App 上设置；注意：首次设置必须要在页面或 App 上设置：交易页面右上角设置图标-账户模式。十五、接口报错：51121 Order quantity must be a mult IP le of the lot size. 在 API 中合约下单是以张为单位的，必须是该币对最小下单数量的倍数，最小下单数量可以通过产品接口：https://www.okx.com/docs-v5/zh/#public-data-rest-api-get-instruments 的minSz 字段获取。

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