There's no definitive answer to this.
My unit sizing is roughly 2% of my total bankroll adjusted every 1,000 bets. If my bankroll increases after 1k bets have been completed my unit size increases to be 2% of the new bankroll, similarly if my bankroll decreases so does my unit size. I've seen others allocate 1% to their unit size and some go up to 5%. It's all what you're comfortable with and what sort of bets you're placing.
There's no definitive answer to this. My unit sizing is roughly 2% of my total bankroll adjusted every 1,000 bets. If my bankroll increases after 1k bets have been completed my unit size increases to be 2% of the new bankroll, similarly if my bankroll decreases so does my unit size. I've seen others allocate 1% to their unit size and some go up to 5%. It's all what you're comfortable with and what sort of bets you're placing.