Having some fun on windows with customizing toolbars in LayOut, there is a built-in image editor that let’s you create or modify the icons. Since there where non for clipping masks, I created some. The image editor is a tiny pixel editor inside the windows version of LayOut, and you can even customize the image editor, too!!
Could your new Clipping mask icon be at all related to a certain pesky little ailment doing the rounds right now? Perhaps instead of reading Create Clipping Mask, it should read Covid Aware Area?
Upgrading basically means installing another program. It’s a relic from the ‘classic license era’. With the new introduced fileformat, which basically means that any future version of SketchUp can be opened with 2021,I hope they tend to switch to a ‘versionless’ version and upgrades.