Having a space to work is crucial for your state of mind and not just in terms of being in a “working” mind-set but so you are able to turn off when the working day is over.
Where possible, set aside a specific, separate area in your home where you can set yourself up – ideally with a properly adjusted desk and chair, similar to your workplace.
The NHS advice is that you should adjust your chair so you can use the keyboard with your wrists and forearms straight and level with the floor.