On iOS and iPadOS, the setting is tucked inside the General section of the Safari settings.
Sometimes settings do not take effect immediately on active tabs. After changing your settings, fully quit Safari (Command + Q on Mac, or swipe up on iPhone/iPad) and restart the browser. safari unblock pop ups
If you have disabled the pop-up blocker but windows still aren't opening, other factors may be at play. On iOS and iPadOS, the setting is tucked