how do i delete a album in iCloud after i remove the photos out of it

There is no way to delete untitled empty album from iCloud.com ( as it can't be selected and also there are no photos inside it ) .

As you have removed photos from it ( and dragged and dropped over another created album from Mac photo application ) .

Also you can't select the trash icon in iCloud.com with untitled empty album it will be dimmed .

The only way is to delete untitled empty album is open photo application , right click on it and delete album .

Note : the untitled empty album can be named .

on iCloud, choose MY ALBUMS on the left. Select the album. Click the TRASH icon on top right.

Try - https://www.idownloadblog.com/2019/03/04/delete-photo-albums-on-iphone-ipad-mac/