Hello sabena,
Yes AR can flip an image.
To do so you can use the Transform tool to flip any single layer or, if you make a selection first, just one part of a layer.
If you have layers in Groups then using the layer’s menu item,’Transform Group Contents’ you can flip everything in the group at once.
If you need to flip an entire painting, with all it’s layers and groups, this can be done from the Menubar > Edit > Transform All Layers.