Blender 2.8: Meshes disappear when hitting number keys above the letters While adjusting my shapes in object mode, I accidentally hit one of the number keys (the one above the letters / not the numpad).
I'm just to using those shortcuts when being in edit mode.

I've attached my file for reference: https://drive.google.com/file/d/1-9tS0X-jeesMfjx16EeVbZIbj09WqXE4/view?usp=sharing

While hitting the numbers, you'll notice the meshes will change.

Thank you in advance,
Welcome 

You have 3 Collections (of objects) in the Outliner (see screen shot above).

When you hit the 1 key you are showing only the objects in first Collection.
When you hit the 2 key you see only objects in the second collection etc .

If you look in the Outliner when hitting those keys you will notice how the little Eye icons are being enabled or disabled.

To see all the objects in the 3 Collections at the same time in Object mode again,
you need to go to the Outliner and manually enable the relevant little Eye icons.