Godot 4.3
The guy says to enable editable children, but there’s no such option for godot 4.+, no info on the internet either
I’ll be very grateful if you help me find this or similar functionality (or help me attach weapon to a bone of the character in the scene)
I’m not sure why u don’t have it or at least can’t find it, but try just right click in the node that you want to edit the children.
It should be the 7th option from bottom to top and also the first check box option.
If you really can’t see it, pls try to share a screenshot of it 
well I saw the option after I’d posted the question, but I couldn’t delete the question… thanks anyways!
