how do you bring an app screen down to see top bar

That usually means Reachability on an iPhone: swipe down on the bottom edge of the screen to pull the top part down, then tap outside the lowered area to return it to normal. On older iPhones with a Home button, double-tap the Home button instead.

For an app window on Windows or Mac that’s stuck too high or off-screen, try these steps:

1. Hold Shift and right-click the app in the taskbar or dock.
2. Choose Move.
3. Use the arrow keys to bring the window back until the top bar appears.

If you’re on iPad, swipe down from the top to reveal the app’s menu bar in supported multitasking modes.

If you want the exact steps for your device, which one are you using: iPhone, Android, Windows, Mac, or iPad?