These is the way for opening AppGrid only using mouse .
1 Click Activity Button of top left
2 Move the pointer to Show App Button of bottom right and Click it.
User have to move mouse long distance .
I think GNOME is not easy to use for people using mouse especially beginners🔰.
It had better change UI for mouse users.
My idea is showing Dock always. You can open App Grid only one click. However I know GNOME‘s developers hate it😢
Do you have any idea?