How to make sliding movement at RogueLike 2D.

Hello, I'm new to Unity and I'm doing the RogueLike 2D tutorial. By default the player moves one tile at a time. And I want to know how I get the player to move freely until it collides into a wall or other collider.

Like the 2048 game where the squares advance in a straight line and only stop when they collide in the wall or in other squares.

Below is the part of the code declaring the move. How can I change to leave the move the way I want?