@Andreas, just go to the spatial properties select the shape in the collision shape preview window and hit the delete key. Here is a video on spatials and renderers as well:
@Andreas When you select the shape does it highlight red? Do you want to remove collisions all together or just remove the collision shape and replace with another shape?
If you want to remove collisions on an object completely then add a basic spatial and remove the collision spatial.
@Andreas, oh I'm sorry your asking how to hide the debug outline when running the game from the editor? Currently that is the default setting when testing the game. When you publish the game it is removed in the production build of your game.
What we can do is integrate the collision shape toggle that is in the editor to the game preview when you run it. That would be no problem.
@Vadim, the debug shape layer is now tied to the visibility toggle button on the right side toolbar. Turn off the debug layer in the editor and it will be turned off in the final production build. This was introduced in the most recent update.
In the next update will force the debug layer to always be hidden for production builds.