how to mark not only one note but several

I guess it is quite easy, but can’t find it.
Thanks a lot

You can click and drag and enclose the notes in a box, called “marquee” selecting. Or you can click one note, then hold Control (on a PC) or Command (on a Mac) and click each note to select.

The team is working on additional ways to select notes, which should be available in the first few patches (probably by end of November the first patch will be out).

You can also use Shift+left/right arrow to extend the selection, but you will often run into an invisible barrier that prevents further notes from being selected, which is one of the things we need to improve.