So Sasuke does not always have to use Rinnegan’s powers, but it always will be manifested in the eye, and it won’t disappear. Therefore, Sasuke eventually used his hair to cover his eyes to prevent himself from being attacked by his enemies.
Out of many powerful techniques like Genjutsu, Taijutsu, and Ninjutsu, Dojutsu is the most powerful Jutsu you can find in the Naruto universe. Rinnegan is one of the most powerful Dojikus, and his eye techniques mark a turning point in his abilities.
Despite having the Rinnegan, Sasuke also possesses Sharingan, which allows him to enhance his visuals. Besides this, the power of the Rinnegan allows him to manipulate gravity and dimensions.
This allows him to clearly adapt to the battle as he also has the power to summon meteorites and control terror beasts due to the power of Genjutsu. Therefore, this gives Sasuke a tactical advantage when fighting on double force.
The use of the Rinnegan abilities requires a huge amount of chakra. Therefore, Sasuke normally uses the Sharingan to reserve some of his chakras.
And, it does not affect Sasuke much as he possesses other powerful abilities like Chido and Taijutsu that make him one of the most formidable foes.
So, Sasuke can never deactivate his Rinnegan.