Drop-down menu bug - shows 'discrete' GPU selected, even though it's actually running 'integrated'
If you select 'integrated only' GPU from the drop-down menu, the tick only ever sits next to 'discrete only' (even though the name of the GPU running is definitely the integrated one & the 'i' is shown in the menu bar)...

This is on an Early 2011 MacBook Pro running High Sierra 10.13.6
Same here. MPBr Early-2013
Same on '15 Macbook Pro - macOS Monterey
Same on '15 Macbook Pro - macOS Monterey
Confirming.
Same Late-2013 MPB Big Sur
Had similar issue. But after building and running the software from the source code, the issue seems to be gone (even when using the original downloaded app).