Layout Preference icon

[MikeWayzovski]

How did you install SketchUp?
Check this post:

Layout Option not an option

Sometimes a good old ‘turning the computer down and starting fresh again’ helps. A lot of Mac-users do not turn the computer off at all, only use the sleep-mode. Then , I would try a reinstall by downloading here [InstallonMac] Just drag (click the left button) the SketchUp folder on the Applications folder and let go! This is the correct way to install on a Mac. There will be a subfolder (SketchUp 2018) in the Application folder with the three apps: [07]

Do not open

This is the WRONG way…