If you are referring to the recommended next search, then I believe that currently you cannot, although a number of people have complained about this to Roku, so maybe they will add that feature in the future.
You can hide some of the recommendations and limit some of the ad content in the settings.
For recommendation rows:
For ads:
Go to Settings
Select Advertising
Check the box for Limit ad tracking
Hide ads
You can hide specific ads on your Home Screen and replace them with other ads. To do this, you can:
Thanks for the clear and detailed answer. However, I'm talking about the add-ons that appear and unwanted tiles on your home screen and you have to go in and tell it to HIDE to get it off your screen. I don't want those ever. It should be an opt in if you want Rokus help to find something to watch.
If you are referring to the recommended next search, then I believe that currently you cannot, although a number of people have complained about this to Roku, so maybe they will add that feature in the future.
I figured as much, just wanted to be sure there wasn't something I would was missing. Add me to the list of those who would prefer to opt in for added items I didn't ask for.
Happy Holidays!