All view can show easily but any how would be possible show bottom view
You can use Camera/Standard Views/Bottom
This can also be set as a keyboard shortcut.
thank you @Box
The camera shortcut views are inbuilt and available from the camera option in the menu or on Mac, the Command key (I believe Control on Windows) and numbers 1 to 7.
A bottom view icon was eventually added in SketchUp 2023.
I didn’t know that, I’ve used shortcuts for standard views, including bottom, for years.
Thank you sir