Can't remove the sync chain and restart a new one

Hi everyone. I have a lot of problem with the sync chain. After finding that this option is back, I tried to sync my computer and my phone.
But I found that my phone was still linked up to my computer (maybe from the v1 sync chain), but no data was synced between the devices. So I tried to remove the phone from the sync chain, but it was still shown on the computer and then I tried to delete the synchain also from the computer but it is not working.
When I click on the “Quit the sync chain” at the bottom of “brave://settings/braveSync/setup”
Brave just redirect me to the previous settings page and the sync chain is not removed.

This is a problem since I can’t sync my devices… I think by reinstalling brave it should fix the problem, but is there any other solution ? Thanks!