The Manchester United striker, playing alongside Jamie Vardy in attack, was the star of the first hour at Elland Road and capped his performance with a spectacular 25-yard strike .
The 20-year-old's display seemed in stark contrast to those he delivered for his club for much of 2018, which prompted speculation about his future given his apparent lack of suitability to Jose Mourinho's plans .
And Rashford felt his performance in Thursday's game, in which Danny Welbeck headed in the second goal, was helped by his more carefree approach.
"You work on them in training so, when one comes off in a game, it's the reward you get," he told ITV when asked about his stunning goal.
"I'm happy with the game and the result. I feel like we're in good physical form.
"I just tried to play free and enjoy myself. It's good practice for what we need in the tournament."
"It means a lot to be involved but going and hopefully playing a major part is my main aim," he added.
"The games are just to showcase ourselves to the fans how far we've come. We know in training how far we've come.
"Anything is possible. We have to go with the highest expectations."