You can disable workflows on your projects by following these instructions:
There are two ways you can access the project settings page.
On the Organization’s page, click on the […] icon on the top right corner of the project, then select “Settings.”
Within the project page, click on the ellipsis (…) icon towards the top-right corner of the screen, then select “Settings.”
On the Settings page, click on the Disable workflow button.
Confirm that you want to disable the workflow by clicking the OK button.