As Thomas said, it shows places based on the current extent of your map. If you want places in the Netherlands, you should zoom in to the Netherlands. If you put the Netherlands as your default search place in your account settings, you will always start zoomed in to the Netherlands.
I think “useful” is fairly subjective, and iNat intentionally doesn’t put a lot of restrictions on what kinds of places can be added by members of the community. If you have concrete suggestions for how you think places of interest can be improved (e.g. it should only include places that are fully contained within the current map bounds), you can add to the Explore brainstorm here.
Any place can be in the list. It has to be in the current map extent, then the list is sorted by admin level, distance, and size, as I said above. I don’t think “of interest” actually means anything here, it could just say nearby places.
Netherlands IS default search area, but it does nothing with it. But i am aways surprised it uses world as default. Other applications and websites guess where you are. It is also not possible to choose a default zoom level as “Current or actual place”
Places where i am, have been or go to. The rest is not of interest.
But most usefull whould be “Where i am” as other apps also do. Or if you can prefill the place with “favourites”.
But for other people the get a local list related to the “Default Search Place”
If this is true, please file a bug report including all of the necessary details to reproduce. I can’t reproduce using Chrome on Windows – with the Netherlands as my default search place, Explore shows me this: