You need to install an SSL certificate on your hosting/VPS first. You can purchase an SSL certificate or use free SSL, for example Let's Encrypt.
APP_URL=http://domain.com
to APP_URL=https://domain.com
.ENABLE_HTTPS_SUPPORT=true
.FORCE_SCHEMA=https
FORCE_ROOT_URL=https://domain.com
ENABLE_HTTPS_SUPPORT=false
{warning} If it doesn't work, you have to config it in .htaccess or Nginx config.