ExpansionGroup Accordion mode is enabled regardless whether setAccordionMode() is set to true or false. Once the group is passed to ExpandableSection.setExpansionGroup() the expandable section behaves as if AccordionMode is enabled, even if ExpansionGroup.setAccordionMode(false) is called before setting the group. Workaround is to call ExpandableSection.setExpansionGroup(null) to set the group to null or not set it at all.