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Gmail has a hidden preview panel that gives you a dual-pane view of your emails—just like in Outlook and other desktop email clients. Here’s how to enable it on the web and choose a horizontal or vertical split.
Gmail具有隐藏的预览面板，使您可以双重查看电子邮件，就像在Outlook和其他桌面电子邮件客户端中一样。 以下是在网络上启用它并选择水平或垂直拆分的方法。
First, head to your Gmail inbox. Click the Settings cog and then click “Settings.”
首先，转到您的Gmail收件箱。 单击设置齿轮，然后单击“设置”。
Choose the “Advanced” tab.
选择“高级”标签。
The Preview Pane option is towards the bottom. Choose “Enable” and then click “Save Changes.”
预览窗格选项位于底部。 选择“启用”，然后单击“保存更改”。
You’ll be taken back to the Inbox, where a new “Toggle split pane mode” button will be visible next to the Settings cog.
您将回到“收件箱”，在“设置”嵌齿轮旁边将显示一个新的“切换拆分窗格模式”按钮。
This is a mouthful, so we’re going to refer to it as the “Toggle preview” button.
这是一个很大的步骤，因此我们将其称为“切换预览”按钮。
If you click the arrow next to the Toggle preview button, you can choose whether the preview pane is split vertically, or horizontally.
如果单击“切换预览”按钮旁边的箭头，则可以选择预览窗格是垂直拆分还是水平拆分。
The “Vertical split” mode means the preview pane opens on the right-hand side of the screen, with your emails on the left.
“垂直拆分”模式意味着预览窗格在屏幕的右侧打开，您的电子邮件在左侧。
This is more useful if you’ve got a wide-screen monitor. The “horizontal split” mode means the preview pane opens at the bottom of your inbox, with the emails on top.
如果您使用的是宽屏显示器，这将更加有用。 “水平拆分”模式意味着预览窗格在收件箱的底部打开，电子邮件在顶部。
This is more useful if you’ve got a square monitor, or you use a wide-screen monitor rotated 90°. But whichever way you prefer to have the preview pane, you can move the edge left or right, or up and down, to size it as you want. Changing between vertical and horizontal will deselect any mail that’s currently being shown in the preview pane, so you’ll have to select the email again to preview it.
如果您有方形显示器，或者使用旋转了90°的宽屏显示器，则此功能会更有用。 但是，无论您希望使用预览窗格的哪种方式，都可以向左或向右或向上或向下移动边缘以根据需要调整其大小。 在垂直和水平之间切换将取消选择当前在预览窗格中显示的任何邮件，因此您必须再次选择电子邮件以进行预览。
Once you’ve chosen your preferred split mode (vertical or horizontal), you can click the Toggle preview button to switch between showing and hiding the preview pane by clicking “No split” on the Toggle preview menu. This won’t remove the Toggle preview button; it will just swap between showing and hiding the preview pane. If you want to remove the Toggle preview option altogether, you’ll need to go back to Settings > Advanced and disable the preview pane there.
选择首选的拆分模式(垂直或水平)后，可以单击“切换预览”按钮，通过在“切换预览”菜单上单击“无拆分”，在显示和隐藏预览窗格之间切换。 这不会删除切换预览按钮。 它只会在显示和隐藏预览窗格之间切换。 如果要完全删除“切换预览”选项，则需要返回“设置”>“高级”并在此处禁用预览窗格。
When you’ve got the preview pane enabled, an additional option becomes available. Head to the Settings cog, click “Settings,” and in the General tab that opens there will be a new Preview Pane option about 2/3 of the way down.
启用预览窗格后，可以使用其他选项。 转到“设置”齿轮，单击“设置”，然后在打开的“常规”选项卡中，大约有2/3的位置会有一个新的“预览窗格”选项。
This option lets you choose when a mail is marked as read if you’re viewing it in the preview pane. The options are:
如果您在预览窗格中查看邮件，则可以使用此选项选择何时将邮件标记为已读。 选项包括：
- Immediately 立即
- After 1 second1秒后
- After 3 seconds (this is the default)3秒后(这是默认设置)
- After 20 seconds 20秒后
- Never决不
Choose whichever option you want, scroll down to the bottom of the page and click “Save Changes” to return to the Inbox. This setting only has an effect when you have the preview pane enabled and have chosen either Vertical or Horizontal split. If you disable the preview pane functionality, this option will disappear.
选择所需的任何选项，向下滚动到页面底部，然后单击“保存更改”以返回到收件箱。 仅当启用预览窗格并选择“垂直”或“水平”拆分时，此设置才有效。 如果禁用预览窗格功能，此选项将消失。
Now you can preview your emails as if you’re using a desktop email client. Sadly this option isn’t available in the Gmail mobile app yet—which would be useful for tablets—but you can view Gmail through a browser on your mobile device if this Preview Pane is a game-changer for you.
现在，您可以像使用桌面电子邮件客户端一样预览电子邮件。 遗憾的是，此选项在Gmail移动应用程序中尚不可用(这对平板电脑而言非常有用)，但是如果此预览窗格对您来说是一个改变游戏规则的功能，则可以通过移动设备上的浏览器查看Gmail。
翻译自: https://www.howtogeek.com/411611/how-to-enable-gmails-hidden-email-preview-pane/
html邮件gmail