A common problem is when a user suddenly finds that when editing text, the text that they are typing is replacing existing text, thereby overwriting it. This is a result of a simple slip of the finger on the Insert key on the keyboard putting the software into Overtype mode instead of the default Insert mode.
Possibly, in recognition of this common error, Windows 10 seems to have overcome this problem by disabling Overtype mode by default. I simply cannot imagine why you would actually want to use Overtype mode in the first place!
The screenshot below demonstrates how to find the Windows 10 settings:

- Select Options from the File menu
- Activate the Advanced options
- Ensure that the Use the Insert key to control overtype mode option is deselected (it is off by default)
- Click the OK button