Hi
Welcome to Microsoft community.
I'm glad to help you.
To make sure that your program is really gone, is it also not found in the setting apps list? It will not go away under normal circumstances.
In the meantime, you can also reset the store app to check if it works.
*"Win" logo key + "Q" to open Search box, enter "Microsoft Store", right-click "*Microsoft Store" > "App Settings" > "Reset".
You can also create a new local administrator account to check if the installed store apps will disappear.
If you need more help, please don't hesitate to let me know.
Best regards
Derrick Qian | Microsoft Community Support Specialist