Step #1:
login to your Binance account on Binance website
Step #2:
go to futures part, Click on "preferences". on mobile version,first you must Click on the 3 dots at the top of the page and then click on "preferences".
Mobile Version
Step #3:
on preferences click "Position mode" ( on mobile version "Position Setting")
Desktop Version
MobileVersion
Step #4:
select "one-way-mode"
