Hi jozefmw, how's it going? Good to know you are enjoying Peppermint

. Reducing the icon size is an easy one. Open the file manager:
menu>Accessories>File Manager PCmanFM . Once that has opened select
edit from the taskbar. Select,
Preferences then
Display. When that window opens you'll see the controls for icon sizes.
I have noticed that sometimes when changing the icon sizes, the positions of the icons become out of line. To reset this.
Right Click anywhere on the desktop. Select,
Desktop Preferences. After the window opens, select
Label Text Font. Select
OK from the new window. The desktop icons will realign themselves. I hope this helps, have fun

!
Tip: To open the file manager from the command line, Open a terminal,
Ctrl+Alt+t. After the terminal opens enter:
Hit enter and there is the file manager.