Rancher user interface doesn't seem to be good, i need to zoom out to see lists of role when selecting it.

That has been fixed at some point. I can't find the specific commit but in 2.6.7 the modal will scroll

Ok, will try local first then deploy it on production if all will be ok after update, thanks! @stocky-account-63046

Found it, https://github.com/rancher/dashboard/pull/5842. It was fixed in 2.6.7, not before