title: Changing GitLab CI Multirunner executor after initial configuration
body: <p>I am reading through <a href="https://docs.gitlab.com/runner/executors/#selecting-the-executor" rel="noreferrer">GitLab CI Multirunner documentation</a> where it walks one through how to set up a GitLab CI Multirunner executor, but I can't seem to find anything about changing the executor once initially set, either in the docs or searching online. Is this supported?</p>