No, it's definitely Apple - a new feature in Sonoma OS. I've had the same version of Microsoft software on my Mac for a few years with no recent upgrade. But immediately upon upgrading the OS to Sonoma, the blue arrow appeared in all my software. Specifically my Adobe software such as Photoshop, in the text fields. Microsoft would not have the power to do this Apple OS wide. But Apple would. Anyway, it turns out not to be as big of a pain as I thought, because it's only when caps lock is on. That's why it's called caps lock indicator. But some of my work flow scenarios require caps lock to be on, and then this feature becomes extremely annoying. Not adding a simple way in System Settings to turn this feature off is very short-sighted and lame on Apple's part. Not only that, it's a stupid unnecessary feature.