Open File Explorer Options ... You cannot reset File Explorer in Windows 11/10 because there is no such option available. Instead, you can restart File Explorer. To do so, ...

1] Disable checkboxes in File Explorer. If checkboxes are enabled in File Explorer, this may be one of the reasons why you cannot select multiple files and folders in Windows 11/10.

Here's how to open File Explorer using the Windows-X menu: Press the Win + X keyboard shortcut or right-click the Windows icon in the taskbar. Click on File Explorer to open a new app window.