Hi!

You mean the bottom 4 apps on the home screen in the dock, which do not move when you change pages on the screen? If yes = This is normal and intended by Samsung's TouchWhiz software.
However, if this bothers you and you are somewhat familiar with Android technology, you can also download and install the CPL Launcher (Customized Pixel Launcher) from the Google Play Store.

This deactivates the Samsung interface (TouchWhiz) and switches on the Google interface (Pixel) instead.
In addition, you now have the possibility to change all the icons / fonts / colours / etc. and adapt them to your needs!