if you mean the event editor objects list, then you can organize them by type.
click on the object, then there is a field called "category" in the properties bar. which allows you to group objects by named categories.
This is for Construct v0.98.9. This is the old way.
In the projects tab on the right, right click the "Objects" folder and click "Add object folder". You can then drag the objects from the "Default" folder to your new one.
This is for Construct v0.99.3. This is the new way.
And I'm trying to get my character to jump, but it wouldn't. The lesson 2 on the platform school tutorial has jumping, but I can't figure out what he did to enable jumping. Where did he set jumping? because I can't find it in the event sheet.
You jump by pressing the jump key. It's built in to the Platform Behavior. Are you sure you assigned Platform Behavior to your sprite (in the Sprite Properties bar)? If so then check what your Jump key is set to by looking at the controls in Application Properties.