05-06-2021 5:35 PM
Based in the UK with a France registered account, the default language will remain French until you contact Customer Services and request that they assist in transferring the account registration to the UK site >
https://www.ebay.co.uk/help/home
Your feedback shows very little activity over the last year, so how many messages do you have?
Do you browse items listed on French Ebay, if so you could end up logged into the wrong site until next time you log into ebay. uk.