"Deny full control" on a folder, how to get access again ?

Hi,

For a folder, on properties, security tab, I've set "Deny full control" for every user.

Now I cannot do anything with this folder. It's the "Bonjour" folder with the Apple app.

How can I get access again, and delete this app and folder ?

It's possible.
Solution here :

Take ownership of files and get full access in Windows 10

The deny option is best avoided whenever possible. It has implications that are often missed. Deny overides all other permissions. You might have full control over a folder but if you are a member of a group, and everyone includes everyone, that is denied acess you have no access. But again, it is best avoided.