Reporting 401 K withdrawal after retirement

I have retired for 2 years and left my 401 K with one of my previous employers. I recently withdraw money from that fund and then later took it all out and transferred to another financial institution as Traditional IRA. Where in 540 EZ will I report the amount I withdrew? I am qualified to use 540EZ. How about in 1040SR? Report under taxable pension?  Thank you.