I want to introduce in an interface a series of fields that will collect text, with rounded edges, but I can't find any property that allows me to do so. Would anyone know how to do it or if another component is more useful?
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The configuration is present in the "Site" object.
So you can't really do it on individual textFields, rather it happens on the site level. So any interfaces that is plugged in that site, in anyway, will inherit this configuration from the site directly.