How can I select object in scene and move it while in PLAY mode?

Hi all,

I have a building filled with various objects. With the help of a member here I managed to make it so that when I enter Play mode and hit a keyboard key my view switches from the default “first person” mode to “top down”. While in “top down view” the ceiling of the building gets hidden and I can see the walls, the floor and the objects inside.
I need to be able to select the objects inside and move them around. It would be ideal if there was a way for a gizmo to appear when an object is selected so that the player can just drag it in X and Y direction.
I already made it so that the mouse cursor would appear as soon as I enter Play mode.

I have no idea how to proceed after that though…

Any idea, guys?

Thank you very much.