联系 Microsoft 支持人员。查找常见问题的解决方案，或从支持专员那里获取帮助。 我们将首先向你显示自助选项。其他帮助也可提供，包括与 Microsoft 专家的实时聊天。

After you create your drop-down list, make sure it works the way you want. For example, you might want to check to see if Change the column width and row height to show all your entries.. If the list of entries for your drop-down list is on another worksheet and you want to prevent users from seeing it or making changes, consider hiding and protecting that worksheet.

Things to try first. Try these things first to help you fix or narrow down the connection problem. Run Get Help to troubleshoot and fix common connection problems. Right click the network icon in the right side of the taskbar and select Diagnose network problems or open Get Help for Network & Internet

Windows 10 Pro offers more advanced security and business networking features, including: BitLocker Drive Encryption

Important: Section breaks are different from page breaks.If you already have a page break before the page where you want to change the header or footer, remove a page break and replace it with a section break as shown below.

Adding Emojis to your conversation. Below the message box are three buttons to help you insert content into your message. The emoji button opens menus where you can quickly search for what you want.

Why does my reading pane have a dark background? When dark mode is turned on, the reading pane has a dark background to reduce eye strain. You can make the reading pane brighter by selecting at the top of the reading pane. If you don't see the button, select .

To find touchpad devices, select Human Interface Devices or Mice and other pointing devices, then right-click the device you'd like to update.

Browse on the go with the new Microsoft Edge for Android and iOS devices. Microsoft Edge offers better protection and privacy, and can sync your favorites, passwords, and more across your desktop and mobile devices.

Under Customize toolbar, for Show favorites bar, do one of the following:. To turn on the favorites bar, select Always.