From 2D to 3D

Create a frame that will act as your 3D environment (also known as your camera)

In the Design panel, click the 3D toggle to enable 3D for this frame

Set a Perspective value
→ The lower the number, the deeper the 3D effect will appear

Now, any frame placed inside this 3D environment — and also set to 3D — will exist in a true 3D space
→ You can move and rotate it on the X, Y, and Z axes