In my case, Once I have chosen an option from the dropdown created using post object option from ACF, I can only change the value to another but not reset it back to blank.Most of the sites keep a close/remove button next to the dropdown so that you can unset the dropdown.
Could you please make sure that you have set the “Allow Null?” option to “Yes” on the field settings? If you have set it, you should see an x button in the selection field. I’ve attached a screenshot for your reference.
I hope this helps ð
Perfect. I had been simply ignoring that option all this while. Thanks a lot for your time.