It is. Another indicator you get is a status icon next to each file telling you if the file is permanently or temporarily (meaning it will get auto-deleted locally if you don't use it) dowloaded to your pc or if it's only on the cloud.

Oh, and you also get a prompt when you delete a file letting you know that it will be deleted from onedrive as well but it will still be in the recycling bin for a while. The only way to not get that prompt is to tick a box to not get reminded again.

Microsoft software has a lot of flaws but this isn't one of them.