Disney Plus and HBO Max not available in México
You can't go by the box if the TV came from outside of your region. However, both of those are available in Mexico assuming you created a Roku account in Mexico. If you're not seeing those then it's possible that when you created the account it wasn't created as a Mexico account. I would suggest starting over with a factory reset and a new account. Make sure you clear your browser cookies or use a private/incognito browser window to ensure there's no leftover data saved by your browser that could interfere. You may want to close your current account as well. Hopefully these links work:
How to close your Roku® account | Official Roku Support
How to factory reset your Roku® streaming device | Official Roku Support
Links to the Mexico channel store:
As for the search, you should have that as well:
"Roku Search is available in English in Canada, Ireland, the United Kingdom, and the United States, and in Spanish in Mexico and the United States"
How to find movies and TV shows using Roku® Search | Official Roku Support
