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
If you want to get one unique input element, you need something like this :
For the first XPath :
//span[contains(text(),'Select Date')]/following::div[@class="Select-input"][1]/input
Replace [1] with [2] or [3] to access the input element you want. I've replaced "following-sibling" from your expression since the span element has no div sibling.
For the second XPath :
(//div[@class='_selectContainer_psmgei'])[1]//input
Replace [1] with [2] or [3] to access the input element you want.