Open the first window
Press Windows key + Left Arrow or Windows key + Right Arrow
Select the second window to fill the other side
Drag a window to the left or right edge of the screen until it snaps
Use the window divider to resize both windows
On Mac, click and hold the green full-screen button
Choose Tile Window to Left of Screen or Tile Window to Right of Screen
Select the second window for the other side
On some laptops, use Alt + Tab to switch between windows before snapping
On Windows 11, hover over the maximize button and choose a split layout
On Chromebook, press Alt + [ or Alt + ] to snap windows left or right