They are collapsed by default but if a user would like to open them they are persisted or lets say you only want the right toolbar open by default a user can open it and it will be persisted in multiple sessions. Majority of our feedback and user testing was showing ppl collapsing the toolbars. This isn't a web map specific property and really comes down to each individual user and their workflows. We also show tooltips so if you hover your mouse of the tools when the toolbar is active you see the name of the tool and don't sacrifice map view space.
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In Map Viewer Classic tools are hidden until you mouse over a layer and you have to click on an overflow to access them to see what is available vs. seeing them readily available in Map Viewer at the toolbar when the layer is selected.
The icons we have used are also extremely similar so if they have used Map Viewer Classic they icons which sounds like above they have
When you are in WAB the users are also being presented with just icons and no text.
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