App not uninstalled

I installed an app to see how it works, after i played around with it, i could not remove it, The app is not showen in my app modul, bit is still on the menu, and working?

You can delete its folder from the "modules" directory.

Good night, i recently purchase the Inventory App, but I no longer want to use inventory in the Akaunting Software, can uninstall inventory and get my money back