A Redmine workflow is the role-and-tracker rule set that controls which status changes are available on an issue. It matters when developers, support agents, managers, or clients should follow different issue lifecycles inside the same project.
Redmine separates workflow settings into two main tabs. Status transitions controls the next statuses a role can choose for a tracker, while Fields permissions can leave a field editable, make it read-only, or require a value for a specific issue status.
Use a test account with only the target project role before handing the workflow to a team. Redmine combines permissions from multiple roles, so an account with extra roles can still see transitions or fields that the target role alone should not allow.
Related: How to set Redmine role permissions
Related: How to create a Redmine tracker
Related: How to create a Redmine issue
https://redmine.example.net/workflows
Replace the hostname with the URL for your Redmine site.
A role/tracker pair such as Developer and Bug controls one set of issue status choices. Use the pair that matches the project team being tested.
For a first triage workflow, New can move to In Progress while direct New → Closed is left unchecked.

Setting Priority to Read-only under New removes that field from the edit form while the issue stays in New. Leave the field blank for the default editable behavior, or choose Required when the role must enter a value before saving.

The Status list should include the allowed next status and omit the blocked status. The read-only field should be absent from the edit form for that status.
Related: How to add members to a Redmine project
If the test user can still select a blocked status, check for another project role on the same user before changing the workflow matrix again.