What happened to the layers buttons?

Ok. I feel really rediculous asking this question–and I rarely feel ridiculous-- but I’m working on something in blender and somewhere during my work the layers buttons disappeared. So . . . where are they?

Thankyou. :slight_smile:

On the header and in F7. If you have no header put your mouse cursor over a border of that window and RMB, choose “Add Header”

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hehe good one i also see that from time to time. it’s a feature!
seriously. it’s because you’r in single mode. usefull to work on one model in a complex scene. to get in and out of this mode. just ples /KEY on you numpad.