Magnifier Scale

In Settings ---- Magnifier: turn it on and INITIALLY there also appeared a scale slidebar which apparently allowed one to set the amount of magnification. This slide bar just up and disappeared and I cannot find any way to get it back. Any help most appreciated

When the scale disappears, do you see a magnifying glass icon ?
If yes, click it.
Is the scale back on ?

NO...I have read many references to the spyglass but it simply is not there