[Solved] Deleting prefabs but keeping objects

Hi,

I know I'm working with an old editor (2017.3), but I have a very basic question I can't figure out :
How can I use normal game objects without them being connected to a prefab??

Every object I have has a prefab, and deleting the prefab deletes the game object too (marks it in red and it is disappeared from the scene).
I would like to have some objects NOT be prefabs.. but I can't seem to succeed to break the bond.
Please, what am I missing?? (attached a screenshot of the menu scene on my project)

Note : yes, I've "inherited" some parts of the project, but I think some of the objects I've created automatically turned into prefabs too..

Thanks,
Booga.

 

Ok, sorry for the hassle -
I've found it only exists in the top menu on my version :
Menu->Game Object -> Break prefab connection.

After doing this on my top objects (for example the menu canvas) , I was finally with a normal game object and I could delete the prefabs

Booga.

 

In the newer Unity it's "Unpack completely"