PS15-Severe Pixelation Occurs In "Process Multiple Files"

Hello,

I recently purchased the Adobe Photoshop Elements 15 program and also recently went from using Windows 7 to Windows 10. There was a program that came with Win7 (Windows Live Media Gallery) I could use to resize-down multiple large .jpg files at once for later processing/sharing without any noticeable pixelation.

Since such a program not available in 10, I used the "Process Multiple Files" option within the PS15 editor. I did this for quite a few folders of pics before discovering severe pixelation in the smaller images (1280x853) when compared to the original (5472x3648).

So I opened an original (5472) in PS15, and using "Image>Resize>Image Size" downsized to the same (1280) and the pixelation did not happen. I believe it's because the right boxes are ticked in the drop-down options in "Image>Resize>Image Size". It appears these options are not available when using "Process Multiple Files".

Am I missing something? I don't see any way to change settings or whatever in the process multiple images window.

Please advise...

Thanks!

/Edit: I think the only solution will be to find a small app online just for downsampling my images-in which case, any suggestions would be appreciated as well

~Suzanne