OBS 31 - how to program scenes ??

I have not been in OBS for at least a year. I downloaded the new update to 31 and I cannot figure how to go from Scene 1 to 2 to 3 etc. automatically. I used to know how from earlier versions of OBS. I look pn You Tube and only see vids on how to add sources. Can someone point me to a tute that will show me please?
 
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