I am new to Azure DevOps and I am trying to create tasks and issues in the backlog first without appearing on the kanban board, and when tasks are ready they should appear on the kanban board. However every new task or issue I create they all appear on the kanban board. How can I prevent the tasks from automatically appearing on the Kanban board?
You can not do that because the Kanban board is equal to your Backlog. You may consider:
Additionally, you can hide the New column: