Sub tools suddenly not displaying when hovering

Hi,
New user here, just learning Sketchup.
I was working, going great, then I notice that my tools no longer display the sub tools when I hover or click the main tools on the left. They had been but not sure if I clicked something to disable them.
Anyone have a clue?
For reference, this is what I mean in the screen capture. I am not seeing the options like the 3 in the pic. Nothing I do will get them to display.

You must be following an older tutorial. The toolbar was changed some time ago. Click on the 3 dots at the bottom of the toolbar to display the rest of the tools.

Thanks!