To close Solitaire TriPeaks, follow the steps for your device:

Apple devices:
1) On an iPhone X or later or an iPad with iOS 12, from the Home screen, swipe up from the bottom of the screen and pause slightly in the middle of the screen. On an iPhone 8 or earlier, double-click the Home button to show your most recently used apps
2) Swipe right or left to find the app that you want to close.
3)Swipe up on the app's preview to close the app.

Android devices:
1) Open the Settings app.
2) Choose Apps.
3) Touch the Running tab to view only active or running apps.
4) Choose the app you're looking for.
5) Touch the Stop or Force Stop button.

Amazon devices:
1) Tap on “Menu” from the home screen of your device.
2) Tap on “Settings” and select “Applications.”
3) Tap on the “Filter by” dropdown menu at the top of your screen and select “Running Applications.”
4) Select the app you want closed.
5) Tap on “Force Stop.”