When selecting multiple files, the easiest way to do so would be to hold down your left mouse button and drag across the files you want to move.
You can also hold shift, and then click to the last file you want to move and it will highlight every folder in the middle as well as the first and the last.
more info: https://www.pcworld.com/article/2086566/the-man...
Disclaimer: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.