If trying to delete large sets of files, in this case over 760 images, the dialog to delete the images is drawn off-screen and you cannot scroll to the bottom of the list.
If deleting a smaller subset of images, it seems to work fine.
Issue re-construction:
Upload greater than 55 images
In file view, select greater than 55 images (the number of images selected may be proportional to the height of your monitor. A horizontal-oriented monitor will not show as many files in the delete list as a portrait-oriented monitor.)
Right-click and select delete, or click the trash can icon.
If the number of files selected creates a list longer than the monitor is tall, the options to delete are off-screen and cannot be deleted. The selection does not scroll with the screen, nor does it resize into multiple columns.
If trying to delete large sets of files, in this case over 760 images, the dialog to delete the images is drawn off-screen and you cannot scroll to the bottom of the list.
If deleting a smaller subset of images, it seems to work fine.
Issue re-construction: