With the new zoom icons in the Scene Editor, we can zoom in, but we cannot zoom out to set the zoom to a value lower than 100%, as we can do in the Tileset Editor. 
Using large tilesets is very common, and the small size of the "Tiles" panel in the Scene Editor makes it difficult to visualize large sets of tiles, so we have to constantly use the scroll bars in that small panel to find in each moment the tile we need, one by one, and this is very annoying, even disorienting, and takes us a lot of extra time when we have to fill large scenes with multiple different tiles.
So I think that zooming out to less than 100% is very necessary.
Therefore, I suggest adding this feature, please.

Using large tilesets is very common, and the small size of the "Tiles" panel in the Scene Editor makes it difficult to visualize large sets of tiles, so we have to constantly use the scroll bars in that small panel to find in each moment the tile we need, one by one, and this is very annoying, even disorienting, and takes us a lot of extra time when we have to fill large scenes with multiple different tiles.
So I think that zooming out to less than 100% is very necessary.
Therefore, I suggest adding this feature, please.