Who has loaded the Garage Talk app? I see it listed at the top, so downloaded it for my iPhone.
I do not see function to go the RX 4th generation and later. So the app shows all RX posts.
Also ads that I am not fond of. Who has it what am I missing in set up to see only RX 2016 and up.

 

I don't use it regularly, but I opened it to test your issue and I see all the RX forums if you just click on the RX folder it expands and lists all generations

 

I do see something weird words listing all the sub forums for each model generation above the main model forum. Doing it for RX and every other model