For Instant Apps that contain the Measurement Tools, please provide a configuration option to set default units (e.g.; English, Metric, etc.)
I had this same suggestion and @KellyHutchins answered it here with a workaround that worked for me:
Measurement widget default unit - Esri Community
Faça login para publicar, seguir conteúdo e mais. Novo aqui? Registre-se gratuitamente.