Images not in the same place when i press play

So i am brand new to unity and i am trying to make a main menu screen and whenever i try and position my panels and buttons where i want them in the screen view but when i press play and it maximizes the buttons and panels are way bigger and not where they appear in the screen view, please help lol

I believe if you select your canvas, you will see a render mode option, try setting it to world space, I had an issue with that myself, and I think that fixed it.