Simulators
Free options and prices without "From"
In your simulator, an option at €0 shows as "Free", highlighted with your theme's main colour.
How it works
Free only with a remap: set €0 as its price with a remap. The customer sees "Free" and the standalone price struck through.
In Appearance, untick "Show "From" before the price" to show the price on its own.
The feature behind it
What it does, in detail, with screens from the app.