What does it mean - status changed from "with editor" to "decision in process" directly in Elsevier within 10 days of submission?
Everything is explained here in detail:
Decision in Process The Editor has registered a decision in the system. The decision may need to be confirmed by the Editor-in-Chief first. The Editor will email you directly with the overall editorial decision, Editor and/or reviewer comments, and further instructions.
When a journal displays the “decision in process” status, it means that the editorial board is in the process of making the final decision about your paper. At this stage when the journal decision is in process, the editor will go through the revised manuscript and your replies to the reviewer comments before coming to a decision. The editor might decide to consult the peer reviewers once more. Sometimes, there may be quite a few papers lined up before yours. This is why this stage might take long. There’s no specific time frame for this; the time may vary depending on the journal and the field. I think it would be reasonable to write to the editor to inquire about the status of your paper if you haven’t received a response even a month after the last status change.
Since you've received "[the] status changed from 'with editor' to 'decision in process'...within 10 days of submission," it might-well be that the editor has decided on a desk reject (perhaps for being out-of-scope), a request for minor amendments (e.g., if you didn't follow procedure), acceptance (albeit, perhaps unlikely), or ...