You can set the position where you expect the field description to appear. You need to go to:

You can set the field description to show up at either top or bottom of the field.

You can also select the field description to show up as a tooltip. This allows users to access the description when needed without occupying unnecessary space on the form especially if you have a lengthy description.

In this configuration, the field description will appear as a tooltip when the mouse hovers over the ⓘ icon beside the field title.