Typical Use Case example:
- some users want to control variables and filters (power users).
- other users want to control filters only (simple users).
- a third set of users only accesses the report occasionally, and wants filters grouped by purpose (geography / business unit / time).

So we have variables and two each of geog/bu/time filters which can be shown on the devices view / RHS sidebar.

Idea:
- allow the insertion of spaces / line breaks.
- allow colouring of devices by group and adding group titles.
- allow devices groups to be collapsed.

Even if I use a different device view for each group of devices, it doesn't allow me to collapse them neatly, which is often necessary given screen size limits.

Ideal use case (see attached illustration):
- key device groups and/or filters are expanded when users open tabs.
- superuser device groups and/or filters can be expanded when users wish to utilise them.
- device group titles and colours/breaks quickly communicate what filters are for with less need for instruction.

If there are a lot of devices, or width is at a premium, then using dividers would allow devices to be separated slightly so the above could be achieved visually to some extent.