CentOS

I use putty running on windows laptop to connect centos8 host.
When create session I enable x-forwarding (Connection->Ssh->X11 Enable X11 forwarding, enter win_host_ip).
on centos host i set environment variable It works good when I logon with root account, but doesn't with user account or admin account which is member of wheel group and has root access in /etc/sudoers At /etc/ssh/sshd_config How to fix the problem?

Which permissions user should have to use x-forwarding?

When admin account which is member of wheel group and has root sudo access remote putty ssh console starts with "$" sign, and only after sudo or su command console has "#" sign. When root logons remotely console starts with "#" sign.
How let admin user console start with "#" sign without sudo or su?

You are not supposed to set DISPLAY after logging in to the linux machine. Ssh takes care of that when X forwarding is enabled. It will be something like localhost:10.0, so the value you set is totally wrong (it's for a direct X connection without ssh forwarding X).

Also, sudo is deliberately set up to NOT pass the environment variable through to thigns that are invoked via sudo.