How to show section plane pop-up window

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Your profile says windows but your image says mac.
But you’ll find instructions for both in this thread.

Section names - Restoring the ability to name my own

It is terrible shortcoming of the current version that you can turn the Section-Naming feature OFF, but not back ON ! It should be an option in Preferences… But it’s not. BUT there is a convoluted way to fix it - at least on Windows… Close SketchUp. Find the folder: C:\Users\YOURUSERNAME\AppData\Roaming\SketchUp\SketchUp 2018\SketchUp It is hidden by default, but changing Folder>Options to show hidden file, or copy/pasting the [edited] folder-path into a Windows Explorer window address-bar…