You can pin an app's screen to keep it in view until you unpin it.
For example, you can pin the TimeTrakGO Kiosk App to prevent it from being closed. To use your other apps again, you can unpin the screen.
Open your tablet's Settings app.
Tap Security or Security & location and then Advanced and then App pinning.
If you can't find it, get help from your device manufacturer.
Turn on App pinning.
When app pinning is on, you need to enter your PIN, pattern, or password before you can unpin.
After turning on app pinning: Go to the screen you want to pin.
Swipe up to the middle of your screen. If this doesn't open your Overview, go to the steps for Android 8.1 & below.
At the top of the image, tap the app's icon.
Tap Pin .
Gesture navigation: Swipe up and hold.
2-button navigation: Touch and hold Back and Home .
3-button navigation: Touch and hold Back and Overview .
If you're asked for your PIN, pattern, or password, enter it.
You can also find more information here: https://support.google.com/android/answer/9455138?hl=en