Press Alt + Enter
Press F11
Use the game’s video or display settings and select Windowed or Borderless Windowed
Lower the resolution
Disable fullscreen exclusive mode if available
Use Windows key + D to show the desktop
Use Alt + Tab to switch apps
Use the taskbar minimize button if the game is in a window
Enable borderless windowed mode for easier minimizing
Set the game to launch in windowed mode from its launcher or shortcut options