You should be able to change your image group by in Windows 10 by right clicking in the folder (not on an image) hovering over the "Group by >" command, and then selecting one of the options. I don't know if "Day" is an option, by in the same Group by selection there is a "More..." command which opens up a list of other options that you can check a box to add to the list of group by selections. Microsoft has provided several options with date, like date taken, date created, etc. Hopefully one of those will work.