Sorry, your question is a bit confusing.
The Apple TV+ is an App on your Samsung TV. It has no other apps in it.
Your Samsung TV has apps of its own unrelated to the Apple TV+ app or the Apple TV box.
If you mean you used to access a physical Apple TV box, that had other Apps installed separate from your Samsung TV, then check you have the correct input selected for the Apple TV box, and that its correctly plugged in to an HDMI port on the back of the Samsung TV.
The Apple TV box is a separate device, and is not directly tied to the Apple TV+ app on your Samsung TV.
You need to select the appropriate input to access devices connected to your Samsung Tv, rather than an app on it.