Can't create/edit workflows

Hi,

Something wrong with my D365 for operations. I with to add / edit workflows. So i go to AP / Setup / Account payables workflow and just click new and see the list of available flows:

So i don't see button "Create" as said in instruction here https://docs.microsoft.com/en-us/dynamics365/operations/organization-administration/create-workflow.

If i click on blue name of workflow i just download files like Microsoft.Dynamics.AX.Framework.Workflow.WorkflowEditorHost.application

Same happens when i click on workflow ID in list of already created workflows.

What i need to do to create/edit workflows?