To move a building or decoration, tap and hold it for some time. Focus on the green area under the object and move it to any location you need. Tap the green tick on the bottom to save the selected position. If the area under the object is red, you'll not be able to move it to the selected place, because there's not enough space.

The factory cannot be moved if something is currently being produced there. Wait for production to finish and try again.

You can't move grass, rocks or trees if you can cut them out. If you want to decorate your camp with similar objects, you can buy the same decorations in the Shop.