Just use the mouse. If you want to scroll down or up in the File Explorer, use the mouse wheel. The blue tab is just to showcase the window system. On the File explorer, you can't open files, only folders. I recommend going to turbowarp, for higher quality pen: https://turbowarp.org/474729836?hqpen
On @l8P 's profile, I found out about the OS wars, and decided to try to make my own OS. This was supposed to be a bigger OS, that would have an image editor, a camera, 2d and 3d videogames, but I don't think I'm going to finish it, so I've shared it. You can feel free to take code from here (the text engine, or the fast rect filler, for example), as long as you give credit. I might try to make a v2 (and finish it). Devlog: 29/june/2022 :: v0.1 :: Started project, and started coding. 30/june/2022 :: v0.2 :: Added the windows mechanic. 02/july/2022 :: v0.3 :: Implemented the basics of a text engine, and in the window you now see the name of the application you're in. Also, added support for different window colors. 05/july/2022 :: v0.4 :: Finished coding a File Explorer (You can't open files, but you can go through the folders) 07/july/2022 :: v0.5 :: Fixed some bugs with the file explorer and added the ability to maximize and close windows (With the icons). 09/july/2022 :: v0.6 :: Made small tweeks, and shared the projects in my alt account. Credits: @-Rex- for his font injector (not the text engine, just the font injector), and his RGB stamping v3 . The font used is Rubik regular (400): https://fonts.google.com/specimen/Rubik