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If you need to group related content and allow user to hide / show it on demand, use ui.expander. It can be useful for cases when there are a lot of form elements and the screen is cramped.

expander-0['form'] = ui.form_card(
box='1 1 2 4',
items=[ui.expander(name='expander', label='Expander example', items=[
ui.textbox(name='textbox1', label='Textbox 1'),
ui.textbox(name='textbox2', label='Textbox 2'),
ui.textbox(name='textbox3', label='Textbox 3'),

Use expanded attr to toggle between collapsed/expanded state.

Check the full API at ui.expander.