Once you’re satisfied with the icon size, close the System Preferences window. As you adjust the slider, you will see the Dock icons change in size in real-time. Drag this slider to the left to make icons smaller or to the right to make icons larger. Under the Dock section, you will find a slider labeled Size. Choose Desktop & Dock from the left category of the System Preferences. The System Preferences window opens on your screen. Steps to Edit Mac Dock size (Dock icon size) from System PreferencesĬlick on the Apple menu icon in the top-left corner of your screen, you will then get the drop-down menu and choose System Preferences from there. So if you don’t like the default icon size on the dock, you can change the Dock icon size bigger or smaller according to your personal preferences and workflow. MacOS provides flexibility so that users can tailor their experience to best suit their individual needs and tastes. You can also adjust icon size on the Dock to make it larger or smaller to suit your preferences. You can rearrange these icons in the Dock, add new ones to Mac dock. Mac computers display application icons at the bottom of your screen known as the Dock.