To access the companion app settings (on iOS) you need to:
Click the hamburger icon
Scroll down
Click Settings
Click Companion app
Why can’t it be directly under the hamburger menu, like it was a long time ago? To me, that is a much more logical place than in the Home Assistant settings
For regular users of the iOS and Android apps, it is there on the hamburger menu, since they don’t have the privileges needed to get to it otherwise. However, for the administrator, it makes more sense, at least to me, to have all settings in one place.