(...) by default the list view is enabled, but you can also choose to switch to the card view (also known as grid view) which uses avatars to depict the contacts visually using cards. Clicking the appropriate button on the top right will allow you to switch between the two views.
I can change the view mode by pressing "t" or "c", but there is no button on the top right.
I'm using v2.10.0 on Firefox 55.0.3 with adblock turned off.
I have never seen (or used) a grid view in contact lists (e.g. segment) and I don’t believe it does exist (any more). I think the documentation needs to be updated.
When I press “c” it goes to card view. If then I press “t” it goes to the table view.
I’ll update the documentation to remove the mention of a button which is not existing anymore.