Hello VTI_16V
I asked the moderator to move this as it seemed to be more about your project than the tutorial, although I wasn't entirely sure which it was.
Thank you for the compliment, much appreciated.
There is a demonstration of reading slider values both in the introductory part of the tutorial and in part 4; Nextion additional features. Follow those examples.
With checked "send component id" I don't get any bytes that are changing when i move the slider.
My methods don't use send component ID so if you are checking that you are not using my methods. You don't need to use it for my methods to work.