To show the minimum value on product page (on page load, i.e. when customer opens the product page), please do this:
Plugin main settings >> Force Quantity Options >> Force initial quantity on single product page >> Force to min quantity.
The quantity field can never show the step value (unless it’s the minimum as well), one thing here, and unfortunately, the plugin can’t check if the minimim value is added to the cart (and shows a different quantity if so).
To understand the behavior better, I have a product with 0.5 min, opened it, page loaded with 0.5 as default, added to the cart, why the page (without reload or refresh) should change 0.5 now to something else? Not sure if it will be convenient to users honestly.