How to Delete All Your Photos from Google Photos
Hover over your first photo and then click the checkmark that appears to select it. Grab the scroll bar on the right and go all the way down to your last photo. Holding down the Shift key select the last photo in the bottom right. Click the Trashcan icon.
You can delete photos by opening google photos webpage on laptop, holding shift and selecting the first photos’ check mark. Next, select the last photo’s check mark, then release shift. This will allow you to select photos in bulk. Then, hit the trash bin icon in the upper right hand corner.