While being in the Select contacts mode in the People app, the pulley menu has a Select all entry. It would be very useful to be able to select just contacts stored locally, both for sharing/exporting and for deleting. It would also be useful in the future, when directly moving contacts between address books may become possible.
When one has put contacts in the local address book by mistake and wants to have them synced there are currently a number of hoops to jump through. Like exporting all local contacts and then deleting them, to avoid having duplicates.
(This is a somewhat common problem that first-time users encounter, and the recovery being needlessly convoluted makes a bad first impression of using SailfishOS.)
Edit to add comment about moving contacts and a link to “the hoops”
Edit to add: This is one of three feature requests to address the “move contacts between address books” need. The other two are: People (contacts) app: Add export tool to UI and People (contacts) app: Add address book picker to import dialog