There is a cupboard behind the office.

It is not ideal from the perspective of geomantic omen. It's better to have a wall behind your desk, because there are many patrons and dignitaries, and you have great support, so you can succeed slowly and steadily. If you are empty after sitting, you will often become weak, uneasy, powerless, invisible, lacking in personnel stability, and even seriously affect your foothold in the company. Especially after sitting in the aisle, people often walk around, which will make you uncomfortable and affect your work efficiency. It's up to you, and everything will be settled. Change to a seat with a wall at the back immediately. If it is not easy to change places, try to configure a fixed table and a low cabinet as support. Then choose a seat with a high backrest.