It's easy to hide behind that desk in your private office and only make appearances when you want, like for meetings or birthday cake. But looking unapproachable is not good for morale. It's super awkward for your staff when they pass you in the hall ready with a sunny smile and you completely ignore them or just grunt hello. Even if you're not the extroverted chatty type, you need to make an effort.
Try small talk – the weather's actually an interesting topic these days – or if that seems too trivial, ask your employees about their weekend or comment on some sports event in the news. Even a simple smile and a pleasant greeting can suffice when you're busy.
Shyness or busyness are easy to misinterpret. Without your realizing it, sitting at your desk all day and avoiding eye contact in the break room may leave your employees with a bad taste in their mouths. They may think you're arrogant or rude or that you plain don't like them. And your friendliness helps set a tone for the entire office, increasing the likelihood they'll work well as a team.