Tried my level best, but I am not able to write a XPath that returns a unique element in this situation.
xpath 1: return all 7 elements under Default value, as all the elements have input tag
//div/span[contains(text(),'Default Values')]/ancestor::div/span[contains(text(),'Select Date')]/following-sibling::div//input
Xpath 2 returns 3 elements, the drop-down in the image.
//div[@class='_selectContainer_psmgei']/div//input
Screenshot: Window screenshot
HTML Screenshot: HTML code