It looks like you are in the Figma Draw. Some Figma Design features are not available while in Figma Draw. Could you try switching to Design? That should bring up the “Position” section in the right sidebar, where you'll find the “Ignore auto layout” button.
@erwin.q, pease check your toolbar and switch the toggle to Design to access all Figma Design features. You might want to check this comment as well.