Okay, this low-rent video might be helpful if your issue is that you simply can't find/see the ellipses that reveals the (broken) control to switch to the classic designer. But this video is going to do absolutely nothing to help anyone that can find and access the control - but clicking the control just does absolutely nothing and never switches you to the classic designer after clicking on it.
For anyone else who comes across this, I will save you time sifting through useless YouTube videos:
In your URL bar you will see the URL that starts with make dot powerautomate dot yada yada yada. Go all the way to the very end of that URL string and you will see
v3=true
Simply change "true" to "false" and press enter. Bada bing!! (No Microsoft pun intended, obviously. No one uses Bing) Page will re-load in classic designer and the useless ellipses/control will no longer be holding you back from the glory of automation greatness.
Enjoy!
