Caption settings are usually just a menu away, but the exact location varies from device to device.
Caption and subtitle options are typically built into a streaming app's playback controls or settings menu, and can usually be adjusted for style and size as well as turned on or off.
Many apps let you change caption size, color, and background for easier reading — worth exploring if the defaults are hard to see on your screen.
Try updating the app and your device's software, similar to the steps in our guide on updating your Smart TV's software, or contact support if the option seems to be missing entirely.
Compare subscription options and device support to find the plan that fits your household.