Select from the list. This instantly reduces them from the default "Medium" size. The Mouse Wheel Method (Precise Scaling):
Alternatively, you can change the overall display resolution: how to make your desktop icons smaller
To make your desktop icons smaller, here are the quickest methods: Select from the list
Sometimes the issue isn't just the desktop icons, but the thickness of your taskbar. If your taskbar icons feel too chunky: how to make your desktop icons smaller
Macs handle icon sizing a little differently, offering a slider tool that lets you fine-tune the size precisely.
If you want your taskbar and text to shrink along with your icons, go to Settings > System > Display and adjust the Scale percentage to a lower value. For Mac Users (macOS)