AllSides correctly lists The Guardian as 'Left'. By adding 'far' to your characterization I can only assume you wish to advertise your own biases and / or denigrate the publication. It is a reputable newspaper with a long history of journalism awards - an appropriate example being this: https://www.theguardian.com/gnm-press-office/2023/jun/23/gua...
The fact that the current administration and its supporters have managed to categorize The Guardian in this manner speaks volumes about their goals wrt any media that attempts to hold them to account.