I think I'm accidentally pressing a button and it's zooming the screen of my Lumia 535. I can't zoom out of it, and only thing I do is restart the phone. How do I zoom out? It's like the tiles and everything goes massive sized so they don't even fit the screen.
It seems you have activated the Screen magnifier feature which is part of Settings -> Ease of access.
You can either disable it there or by double-tapping the screen with two fingers.
In Settings->Ease of access i had to untick the magnifier. Now its okay.