Disable editing of multiple objects in Blender 2.8 In Blender 2.8, if you have multiple objects selected in Object Mode, and then hit Tab to enter Edit Mode, ALL the selected objects (both the yellow active object and the orange selected-but-inactive objects) will be editable. This is new behaviour for 2.8, and while it certainly has its uses, it can also cause unexpected problems if you only want to edit the single active object. 

So I'm wondering: is there any way to disable this feature? I can't seem to find one, but it seems too obvious an option to be unavailable??
From your comments I can see your problem is due to having other objects selected and not knowing about them. Not a real solution for your problem but, whenever I'm modelling with several objects, as a good practice I always tap A twice to deselect everything before selecting the object (I use the Blender 2.79 hotkeys). There are many advantages in being able to go to edit mode with multiple objects and I'm sure you will soon make use of them as well.

Update: For Blender 2.8 it's Alt+A to deselect anything.