You'll lose those days filled with the quiet solitude that fosters concentration. Know-How , my tips book on home office, we need to find that balance in our personal and professional lives. Before the child rises, after the child settles, nap time, play time, etc. That makes it easier for an at-home parent to work. Your friends will tell you kids won't sit in playpens.
Kids are like big people only smaller, and they can be trained to do anything.
Including to enjoy playing in a playpen. Just make sure not to rely on the playpen for extended periods of time. Also, foster naptime for your child. It's more true for naps than for a playpen that kids have their own internal settings for whether they'll take to napping or not. This is exceptional for your ability to focus.