The Windows operating system is designed in such a way that all games and programs are installed by default on the system drive, most often referred to as the letter "C".
To install Valorant on another drive, for example, D or E, after running the installation file in the first step, you need to immediately click on the "Advanced settings" link at the very bottom of the window.
Next, you need to select the directory you are interested in and continue installing the game.
If you need to transfer an already installed Valorant to another drive, you can try moving the Riot Games folder to the desired location and launch the game from there. The folder is located at the root of the "C" drive.