Yes, you can always make changes to the base camp.

To relocate the buildings, drag them to the destination positions. Green boxes will appear when you pick up a building, indicating that the building can be placed there. The relocation will fail if the building is overlapped with other existing objects.

You can also add/remove decors inside your camp.

Steps to add decors:

1/ Tap   on the left side of the game.

2/ Select the [Decor] tag.

3/ Choose the item and put it to your base.

Steps to remove decors:

1/ Select a decor.

2/ Tap 

3/ Tap [Confirm].

*100% of the decor’s cost will be refunded when it is demolished.