TV and STB / cable manufacturers 'power on' to the Home Screen by default. We can usually change this to open to either your desired input / app, or to the "last channel." The settings are generally under the 'power on' or 'display' settings. Below are links to the most common for Flipper customers. Or look in your TV / STB manual or use google:. Click on the brands and operating system:
All Others, like Insignia, Toshiba, etc:
Use your TV branded remote then look in the settings, then follow the onscreen prompts to set your Input / Source / Power On selection as appropriate (different brands may use their own terminology).
You may need to refer to your manufacturers manual, or google your TV brand, followed by something like "home screen power on settings"