I want to reduce the size of the text in a ranking question. In excel in the xlsform

I want to reduce the size of the text in a ranking question. In excel in the xlsform I have entered #### before the text in the labels but it does not change the size and I get the characters #### in front of the text when I visualize the form. I am working with Kobo Toolbox in Spanish. What error am I making? Can you help me please?

Welcome to the community, @rodriher! Maybe you could share the relevant part of your sample XLSForm so that the community could help you identify the issue.