I have my object selected and don't know why the settings are not there. I've tried different objects and it's the same problem. Can somebody help? Edit: I can see all the settings in the Shading tab..
This issue is likely caused by pinning the data-block's properties after an object was deleted. The property tabs can be restored by unpinning.
Description of the pin functionality in the manual:
By toggling on the pin icon to the right, Blender can be told to display in that editor only the currently shown data-block’s properties, disregarding further selection changes. Toggle off that pin to switch back to default behavior, showing active data-block’s properties.
Alternatively you can also uncheck Load UI when opening a project through File > Open in Blender, which ignores all UI settings stored in the project file. This can be helpful for example when loading a project from older versions of Blender with a different UI layout.