Are one journal editor able to see decision of other journal editor in same publisher? My manuscript rejected by the editor of Journal A (MDPI publisher). Then I submit my manuscript to Journal B (MDPI publisher), it rejected again by the editor of Journal B. My question is editor of Journal B is able to see Journal A editor`s decision? Simply different journal editors in the same publisher are able to see each other`s decision?
No. You can see the decisions of papers submitted to your journal, but not to other journals, even if they are by the same publisher. An employee of the publisher with access to both journals might be able to, but not the members of the editorial board.