How to change a folder display setting sin GW18 client.

In previous GW versions, you could right-click on any folder and in Properties you could see Display tab. There you could, for instance, change Calendar folder settings into a Discussion Thread. This helped to see all Calendar items in one raw, where from you could select all and archive as example.
In GW18 client, the Display tab is not listed in Properties of any folder.

In GW18 you can highlight any folder and then right-click into a toolbar section and get menu options where from you can choose Edit Display Settings option. That gives you an option to change folder view settings on any folder.
If you do not see a Toolbar, go into View -> Toolbars and enable at least the "Main" one.