SharePoint app on Windows 10 Mobile 1703

Hi Ciprian, Firstly you are not going mad! Functionality varies across all the major mobile platforms and across all Office 365 apps. Frequently, Windows Mobile is last in receiving features which are already available on iOS and Android versions of apps and this is likely the case here in the SharePoint app. Microsoft's decision here is evidently driven by market share which is dominated by Apple and Android. On balance, it is likely that list functionality will be updated but timing is not always clear. I can say having devices on all three platforms, it is frustrating having all these variations but definitely a reality for us all going forward. As I mentioned, this is not tied simply to SharePoint but to the wider Office 365. Unintuitively it is no longer the case today, in my view, that Windows Mobile is the first choice for Office.