First question on this site and this is probably stupid and I'm overlooking something glaringly obvious but here is goes.
I just recently rebuilt our site in SharePoint Online (2016) from SP07. I used a web parts page to manage our personnel files system - this pulls both scanned physical documents from a document library and various other data from several lists into one central location. There is a staff selector web part with a data connector to all of the others - a staff member is selected and all other web parts are filtered by that staff member, showing only that information.
In SP07, when I created the web part views, this was done by grouping the list/library by staff member and then only showing one group per page. I had the option to collapse these groups by default (I have the same option in SPO). Due to large amounts of data - you can imagine that users may not want everything expanded by default - they would only open (expand) what they need. This worked beautifully in SP07 but in SPO, no matter what I do, all the web part groups expand by default (despite this being set to collapse in the view being used).
To be clear, we are not talking about minimizing/collapsing the web parts themselves but only the groupings used in their views.
Any help would be appreciated.