The New dashboard dialog changed a little in 2.3.0. Start from is now a searchable list with a short description of each starter. In the screenshot it is closed on An empty dashboard, described as “Add the cards yourself.”

Below it are Title (required), Description, Advanced and the Share with everyone in the workspace switch. The workspace I took this on is at its limit, so the switch is off and greyed out, and the dialog says why: the plan allows 5 shared dashboards, 5 exist already, so this one will be personal. To share more, delete a shared dashboard or upgrade the plan. In the shot the title is still empty and Create is greyed out.
Under Advanced you can show the board in the menu of a workspace, or leave it standalone in the dashboards list. The rest is on Create and organise boards.