@JAIO 

By default, Isadora will output video to each display at that display's resolution and refresh rate, so if your computer sees the display as a 1080p 60Hz screen, you don't need to do any additional configuration. 

You'll be able to see what Isadora sees your external display as in Output > Stage Setup

Here's an article on Stage Setup in Isadora (English).

Here's a video tutorial on Stage Setup in Isadora (English).

You may want to use the Zoomer actor or the FFGLPanSpinZoom actor to reposition your videos because a video with an aspect ratio of 16:9 is not going to 100% fit the shape of a screen with an aspect ratio of 2:1. In case you need to do any Projection Mapping to ensure that your content (with a 16:9 Aspect Ratio) fits nicely on your display (2:1 Aspect Ratio), here's a projection mapping Isadora tutorial video in Spanish.

In terms of general configuration for an Apple computer being used for an Isadora project/production, you can follow the setup steps in my macOS Isadora Show Computer Setup Guide (English) to turn off some pesky settings and such. (For German-speakers, here's an older macOS setup guide (German) by @SchaubühneVideo that may have some more technical steps that I didn't think of.)

@jfg

I have two small suggestions for you.

First is @DusX updated  python tools, in the add-ons here. Like you I couldn't understand the first video, but this did help me get started.

And the other thing which has really helped me with Python is using AI. Specifically Claude Sonnet. I like that model particularly because it is good at explaining, which helps me to learn the process. 

When I'm starting a chat I:

ask it to add detailed comments to every line of code explaining what it does in plain English (am sure it's equally capable in other languages!).ask it for a "Step-by-step environment setup guide," including how to install the necessary libraries for my OS.

I just did this for Windows, and Claude Sonnet gave me verbose instructions. Including how and where to install all the necessary libraries, etc. I don't have time to try that all out right now, but will certainly give it a go later.

Meanwhile maybe this is useful...

best regards

Mark (not that Mark, in rainy London)