Hi @Frank_Lovisolo, welcome to the forum!
We’ve tried to make the new Score Editor more accessible and easier to use. In order to achieve that (aside from the massive technology change under the hood), we tidied up the toolbars, and tried to achieve consistent editing behaviour with the rest of Cubase, but also with Dorico where applicable.
There is one notable change, which you may have stumbled over. You should find that moving or transposing notes does in fact still work, but it now uses the key commands in the Nudge category, which also means that the plain arrow keys default to Navigate, changing the selection.