@aaradhya.keerty Why this step is repeating after you switch to window with title “Account Edit: New Account ~ Salesforce - Unlimited Edition”
From your 1st post, I was under impression that you want to select text from the list that shows up on new windows after you will click on Lookup icon and switch back to the previous window.
Also in the last step you are using
But you are already on the same window.