Feature request: new option "collapse all"

[MrChebur]

At the moment when you add data - the groups are in expanded state.
It would be convenient to add an option to automatically minimize all added groups and layers.

[gacarrillor]

Could you show how you expect the layer tree if the proposed option is checked?

I ask you because there could be several ways of collapsing groups and layers, for instance:

• Only collapse the root group.
• Collapse all groups.
• Collapse groups that directly contain layers.
• Collapse layers (so that their symbology is not visible in the layer tree).

[MrChebur]

I think that the implementation of all of these options can be useful to users, but at the moment I as a user would benefit from option two: "Collapse all groups".