Is there a way to extend the walls of an environment?

Halcon Bluesky

I have this environment "Divine Dining Room"

The setting area looks nice to do a render.

The prpoportions of the room are too small, people will not fit in.

Also there is no way how to get a proper view to get the render done.

Now my question is.

Can the walls be extended to an extent that will offer a better view?

I have tried to copy the wall parts so I can have more space, my efforts fail trying to accomplish that.

I bought this long time, there is no way I can ask for a refund.

What do you think? Or I should eliminate/ignore this environment for good.

I can't get a new environment at this moment cause everything has gone up in price and the most dire situation is the currency exchange, making impossible for me to buy anything.

Waiting for your suggestions, thanks!