Certified GKH Gardening Expert
It is best to leave it as is... This is a biennial... meaning it has a two year lifespan. The first year is growth, while the second is flowering. After this, they die. Many times they will drop seed, so you may get more later on, but again, don't expect flowers the first year.
This article will help with the care of these: https://www.gardeningknowhow.com/ornamental/flowers/foxglove/foxglove-flowers.htm