I was on letrozole and experienced hair thinning.
I’m now stage 4 so I’m on fulvestrant and ribociclib. I’ve had hair loss as well as hair thinning and now wear a real hair integrated hair system whixh is beaded into my own hair.
It was my solution but it’s not cheap.
Hopefully you’ll be luckier than me and your hair will not thin so much or come out