Remote work saving my sanity but killing my productivity

So I've been working from home 3 days a week for about 6 months now and honestly it's been a game changer for my family. I can actually eat lunch with my kids instead of grabbing fast food in the car. But here's the thing - my boss keeps piling on meetings because I guess he thinks I have more free time now? Yesterday I had back to back calls from 9am to 4pm and still had to get actual work done. Anyone else dealing with this? How do you set boundaries without looking like you're slacking off?