See these two websites::
https://mixrepairs.co.uk/candy-fridge-freezer-problems-and-troubleshooting/
https://www.maytag.com/blog/kitchen/why-is-my-freezer-not-freezing.html
The ideal temperatures are 4 degrees in the fridge and -18 to -20 in the freezer. If there's only one control the amount of autonomy you have is obviously limited.
Cvgu
January 2023