You may have noticed that uninstalling an app on macOS isn’t as simple as it is on iOS devices. On macOS, you'll need to take a few extra steps to perform a clean installation of any app:
Open Finder.
Go to Applications.
Find Touchpix, right-click on it, and select "Move to Bin." Enter your password if prompted.
In the Mac Menu Bar, click on "Go".
Select "Go to Folder..." from the dropdown menu.
Type in "~/Library/Containers/" and press Enter.
Locate the Touchpix folder, right-click, and move it to the Bin.
Touchpix is now fully uninstalled from your macOS device. To reinstall, simply search for it in the App Store and download it for a fresh installation.