Same here. I assume a thinking pose and look at a corner in the room - that should signal that at least my attention hasn't strayed elsewhere more significant.
My another strategy is to make occasional eye contact while blurring my vision. To them, I'm making eye contact, whereas for me, it's not that different when I'm looking at the corner.
Yeah I’m really good at those hidden 3d pictures. I can split the focus of my eyes super quickly and will do that sometimes while looking at someone if I feel like I’ve not looked at their eyes for too long. On zoom if I’m really listening I’m literally turning my head to the side and possibly closing my eyes.
If you think people can't tell the difference you're gravely mistaken. I also have issues with this sort of thing, but it just requires additional work on my part. Assuming your conversation partner can't read is almost invariably a mistake.
My another strategy is to make occasional eye contact while blurring my vision. To them, I'm making eye contact, whereas for me, it's not that different when I'm looking at the corner.