There are a few UI issues with the impersonation icon.
- In the admin theme, the impersonation icon disappears when clicked on.
- In the admin theme, the impersonation icon is too big. In the admin theme, the main icon is smaller than the site theme, so the impersonation icon should be proportionately smaller as well. This issue causes the icon to overlap the header border.
- The impersonation icon is slightly off-center (actually, I think the main icon is off-center).
See attached for all three issues.