How to train my puppy to be left alone outside of the crate?

My labradoodle puppy is over 5 months old now. She is happy being left alone in her crate but not being left alone in a room. We would like to be able to let her have more space when we go out but she just seems to scratch at the door or whine which she doesn't do when crated. She is happy being left to do her own thing mostly but only when we are in the same room or when she's in her crate. The problem is that she doesn't really have fun in the crate, she will eat and sleep but doesn't have space to really enjoy her toys. So I'd like it if she could be out of the crate and play with her toys when we're out which should keep her more entertained and less bored. I'm really not worried about her destroying things or peeing everywhere, she seems to not be destructive.

Most of the time she isn't really left for more than a few hours but we'd like to be able to go out for a bit longer sometimes and know that she's not just bored in her crate when she wakes up from a nap.