The Flip tool flips objects in the PCB layout such as footprints to the reverse side of the board.
In the Electronics workspace, on the 2D PCB document Design toolbar, click Modify > Flip to open the Flip panel.
Optionally, in the Flip panel, adjust the Routes Mode settings as needed.
In the canvas, click the object to flip.
Optionally, in the canvas, click another object to flip.
When you have finished, click Done to accept the changes and close the panel.