Following the Umbrel Community App Store Template I managed to install Wordpress (you find the app folder here).
I then went ahead installing the plug-ins in Wordpress for BTCpay server and WooCommerce, plus the Ecommerce Modern Stor theme.
Everything works fine, but if I uninstall the app and install it again, the plung-ins and theme are still there. How come?
And how can I prevent that, meaning that when I uninstall an app, everything is actually removed?
It’s the way WordPress stores the information. Deleting the app does not remove everything WordPress created. To remove or delete items in WordPress you have to do it via the Dashboard.
To answer the last question … you can’t. With experience, understanding of file structure, and how specific programs work you can get close but still miss things. Of course, I could be wrong. 
Let me know!
Thanks for your reply.
As a dockerized application, I expect all to be removed when the container is uninstalled.
I probably need to investigate more …
OIC what you are saying. Very nice and congratulations.
