Customize the Finder sidebar on Mac - Apple Support
https://support.apple.com/guide/mac-help/customize-the-finder-sidebar-on-mac-mchl83c9e8b8/mac
WebOn your Mac, click the Finder icon in the Dock to open a Finder window. Do any of the following: Hide or show the sidebar: Choose View > Hide Sidebar, or View > Show Sidebar, in the menu bar. (If Show Sidebar is dimmed, choose View > Show Toolbar.) Resize the sidebar: Drag the right side of the divider bar to the right or left.
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