I have section with multiple column layouts, date fields and drop down fields. When I click on icon to non collapse the section (where few fields are required fields) and click on submit button it allows me to submit and navigate to next page. Expected is since we have validations on fields even though we non collapse the section it should throw error.
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If you create a custom way of collapsing layouts. (with If-Else conditions etc) They are not evaluated while checking validation.
If you have implemented using isCollapsible parameter of the layout then the validation will be displayed.