I have Ubuntu 18.04 and set the Scaling Factor in Tweaks to 1,10 because the 1920x1080 resolution makes stuff on my screen look a bit too small for my taste. That toggled this stickman icon, which now seems to not want to go away from my Panel unless I disable "Large Text".
Is there any way to hide this icon while keeping my settings?
You may use a GNOME shell extension called Icon Hider. It provides you the granular control over the the top bar icons, lets you hide/show indicators individually.
Once installed, toggle off the "a11y" item in the extension's preferences window.
You may have to re-login to see the change.