If you go to Plan without being connected to a Seestar, it will show alt-az canvas.
As soon as you connect a Seestar that is in EQ mode, the Plan canvas switches to EQ orientation.
Here's the exact same Plan with and without a Seestar connected:


It would be great to have a toggle in Plan to choose if we want to use the alt-az or EQ canvas so we can prepare the planning in advance without being connected to the Seestar, just like we have for the coordinate lines.