You can change the appearance of a field in a form.
This page explains how to customize the appearance of form field using Bonita BPM Studio. You can also use a CSS to set field appearance.
The appearance of a form is determined by the combination of settings you configure, and changing one item can have consequences on other items, so it is important to review the form to check that you have the appearance you want. To see the new appearance after making a change, click the Preview icon in the coolbar and check that the appearance of the form is correct.