This lets you quickly find a file you want to open. ToggleWinHook enables or disables the feature that automatically converts new File Explorer windows into tabs.

Windows 10's built-in File Explorer doesn't look very modern. Files UWP - Preview brings a modern file explorer experience that's touch and mouse-friendly, and it looks stunning.

Since the feature was introduced, I only really use separate windows if I expect I'll need move files between them. If you want to open a new tab, just tap Ctrl+T while File Explorer is open.