Closest I've come is being in some interminable meeting with the boss. Just too long. In the age of dinosaurs, we had only desk phones, so I would hold a sheet of paper behind my back saying "Call Me". And there are lots of fake call apps, or you could even put up a home screen with a fake call photo of someone notorious. Unfortunately, notoriety these days is not for good reasons.
That said, please build up some self-confidence, and have some really good reasons to break out of chit-chat, like "I'm late for a zoom meeting" or "Shit, I left my keys in the car". People say, rightly so, that "it's not about you".
In my fly-tying days, I'd feel weird about going to a sewing store. Heck, they had all kinds of yarn, burlap and scissors ideal for fly-tying. I got over the feeling, because "nobody really cares".
Besides, a little notebook or block of postit-notes looks smart. "I have to write down this idea before it goes away forever" and that's so often the truth.
Building self-confidence (or just a don't give a shit attitude) prevents the social anxiety, so you don't have to solve it.
