Microsoft Word, Excel, and PowerPoint open the file in the Protected View mode when you open a file from an online location, such as a cloud storage location, email message, or another insecure location. In the Protected View mode, most editing functions are disabled. Microsoft apps do this to prevent malicious code from accessing your computer.
When you connect to any Microsoft 365 application such as Word or PowerPoint, Microsoft Office automatically connects to or creates a new OneDrive storage. If you don't plan to use OneDrive from Microsoft 365 applications, you can close this storage connection. On another side, you can easily connect to another OneDrive storage.
The Math Input Control dialog box allows you to use various input devices, such as external digitizers, touch screens, and even just a mouse, to write mathematical formulas in the form of equations.