Can I work with version 2.9 or just start again with 2.8?

It seems I need a new revision for the revision... I have more options for hiding the collection and I can't add it after hiding. I can actually do what you did by playing around for a while...  But I can see I also have different options next to the items in the layout list. (Just a thick box and an eye.)

  • spikeyxxx replied

    For the options in the Outliner you can open the Filter dropdown and choose what toggles you want to see:

    For the first part of your question;I will have to watch  the video first before I can understand it...

  • spikeyxxx replied

    In 2.91 you can hide/unhide a Collection from the View Layer by using the checkbox:

    This is exactly the same as right-clicking the Collection and under View Layer select Include or Exclude from View Layer:

    When you've hidden a Collection this way, you can press SHIFT+A > Collection Instance > ...   to add an instance of that hidden Collection

  • agnesmate replied

    Thanks. Some more wandering around this panel could make some use. 3D drawing was my hobby 3-4 years ago. I totally forgot what can I do in this Outliner Panel. :)

  • agnesmate replied

    Aah... Now I see what I have done. 

    Video: 'Under Visibility... No. Sorry... Under View Layers...'   ...R E V I S I ON....

    I got stuck at Visibility. It's a little bit different, nevermind...  XD   

    Thanks for your help!