I guessed at what the object was being called (in this case, it was 'Control 62') and then hid it. Well, at least most of it. Part of the dropdown is still visible, but not much, so this is the best it can get.
That should not be the best you can get.
Any reason you opted to hide it rather than select it and hit the delete key ?
One issue you might be having, is make sure you have
Developer > Design Mode activated (it should go a darker grey and any object you click should immediate show the border selected)
If after hiding or preferably deleting Control 62, you still have a DropDown, then there is another control at the same location.
Does that mean there are other objects on that sheet that you want to keep ?
If there are no objects you want to keep select one item hit Ctrl+A and then hit delete to delete them all.
If you don't want to delete them all and can't identify which is the right object, with Design mode enabled you should be able to select the other object in the worksheet and hit delete.
If you can't resolve it, select the tab of the sheet, copy it to a new workbook. Select all and hit delete, which should delete all your data but leave the objects.
Then share the spreadsheet with us on dropbox, onedrive or some other platform (share to anyone who has the link)