the training video is slightly outdated, some time ago, they released a new way of organising the toolbar.
it’s all here :
basically, instead of stacks of tools, you have a dynamic toolbar that you can compose on the go. The old way was space efficient but tools that you use all the time would take the same space as tools you seldom use.
with the new method, you can make your toolbar as you work. simply look at the three dots at the bottom and organise.