How to find true center?

How to find true center when designing your page. There line in the center appears like 3-4 times for me. Which one is the true center of the page?

also sometimes the center line does not pop up at all no matter what

Finding the true centre can be tricky, especially when you have several other elements in the same screen.

What I do when I really need the true centre is to create a blank new screen, completely separated from the other screens, and design the element I want to be centred there. Once you have the element in the centre, copy and paste it into the corresponding screen.