This game needs OOB, counters and an option to turn off this "unit clumping"-feature.
It has an OOB and one that you completely control yourself.
On the right side is a grouping they call theaters but it doesn't have to be a theater. You can use this in conjunction with the actual "groups" to create an OOB for an attack like against Poland. For simplicity sake create three of these theaters but just rename them to some Army Group. One for Poland, one for the west and one for the rest of the troops and reserves.
Each group can be a corps in this army. And each corps can have their own detailed BP. Larger groupings can be renamed as armies and include 12 divisions or more if they use one of those FM's that are shown. Now since a BP can have multiple attacks, multiple advances etc. this allows you detailed control over that specific group (corp or army) And clicking on the right side AG only shows the corps assigned to it.
If you actually watch the videos the unit "clumping" is in direct relation to zoom level. At very close zoom levels there is no clumping outside of the province level. Go farther out and it appears to group via state or some other region level. And I bet if you zoom out far enough you can see summary counters for entire fronts.
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