I zoomed out by mistake and now my drawing's disappeared

[DaveR]

See:

SketchUp Pro 2019 = Let's talk about Saving

With SketchUp Pro 2019, we have made some changes to how we execute Auto-saves. Let’s go over Saves, Backups, and Auto-saves with SketchUp to make sure there’s a good understanding. Save - When you save a SketchUp model, you are saving a .skp file. This file contains everything used to make your model, from geometry to components and materials. It’s all in there. If you have a bunch of really large images or textures in your model, they will be there too AND they will impact the size of your .s…

Best practice, though is to save the file early on and make periodic manual saves.