Windows 10/11: Press Windows key + Left Arrow to snap left; Windows key + Right Arrow to snap right
Windows 10/11: Press Windows key + Up Arrow to maximize snapped window; Windows key + Down Arrow to restore
Windows 10/11: Use the Snap Assist popup to choose the second app for the other half
Windows 10/11: Drag an app window to the left/right edge until the snap outline appears, then release
Windows 10/11: Use Settings → System → Multitasking → Snap windows (enable if needed)
macOS: Click and hold the green window button, then choose “Tile Window to Left of Screen” or “Tile Window to Right of Screen”
macOS: Use Mission Control/Stage Manager options (if enabled) to arrange multiple windows side-by-side
iPadOS: Open the app switcher, then drag an app onto the side of the screen; repeat for the other side
iPadOS: Use Split View to keep both apps visible in two panes
Android (most devices): Open the Recent Apps screen, then choose “Split screen” (or drag one app to the top/bottom)
Android: If prompted, select the second app to fill the other half
Android (Samsung): Open Recent Apps, tap “Split screen,” then select the second app
Chromebook: Press Alt + [ ] (or use the window snap controls) to snap windows to left/right; then select another window for the other side
Chromebook: Drag a window to the left/right edge until it snaps, then choose the second window