Objects can be moved strictly along the grid. How to fix?

Question

2D

The position of objects when moving changes exactly along the grid. For example, if an object is at position 0.00, then with the slightest drag it will move 1.00 instead of moving only a few tenths, such as 0.10 or 0.25.
What did I press wrong and how to cancel this mode? It interferes with building levels.

Answer 1

button at the top left. There is a grid and a magnet. Click on her