Modifier prices are managed on the modifier product itself, not on the modifier group.
Change the price
Go to Products → Product Catalog and open the modifier product.
Click the Pricing & Locations tab.
Under Prices, click the Regular price field and type the new price.
Click anywhere outside the field. The change saves automatically and a confirmation banner appears, with a shortcut to add the item to your shelf-tag print list.
Heads-up: It can take a little while for the new price to show on the Modifiers list page, but the price itself is already live.
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