My concern is to know and automatically see the area in hectares of the field after taking the polygon

[Kal_Lam]

Welcome to the community, @peter243722! This post discussed previously should help you solve your issue:

Adding multiple areas in KoBoToolbox

@carlos_diaz1978, maybe you could do it as outlined in the image shared below: In the survey tab of your xlsform: [Image 1] Data entry screen as seen in Enketo: [Image 2] Data entry screen as seen in Enketo: [Image 3] Reference xlsform: Area Calculation.xls (27 KB)