With ChromeOS 70.x, Google has altered how the icons on the Shelf display. In the latest versions, the icons are larger and centered on the Shelf – much like how icons are shown on a Mac computer.
If you don’t like this new design and would like to go back to the old version, use the following command to locate the setting:
This command displays the options of the ChromeOS shelf. With 70.x and better, the Default is the new design. To go back to the old design, choose the Disabled option.
NOTE: Keep in mind that this flag option is only available for the ChromeOS 70 range. This option has been removed in 71 and better, and Google no longer allows you to use the old Shelf configuration.