We have a VS solution that currently uses the Hosted VS2017 agent on Azure DevOps. We now want to upgrade our solution to VS2019. However, I can't see any way to amend / update the Azure DevOps pipeline to use the windows-2019 agent. It only seems to be available when creating a new Azure DevOps pipeline.
Is there a way to amend / update our current Azure DevOps VS2017 pipeline to the 2019 hosted agent without having to re-create our pipeline from scratch?
UPDATE
As can be seen from the screenshots below VS2019 doesn't appear in the dropdown list of available agent pools.