Width of caption of rich text icon

how to set the width of caption in rich text icon?

a!columnLayout(
contents: {
a!forEach(
items: local!navSectionData,
expression: if(
local!collapseNav,
{
a!richTextDisplayField(
value: {
a!richTextIcon(
icon: fv!item.icon,
caption: fv!item.description,
link: if(
not(rule!APN_isEmpty(fv!item.processModel)),
a!startProcessLink(
processModel: fv!item.processModel,
processParameters: {
isNew:true()
}),

a!dynamicLink(
value: fv!item.id,
saveInto: local!activeCollapsibleNavSection
)
),
linkStyle: "STANDALONE",

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