How can I open multiple Google or Gmail Accounts in one Browser window

when i switch account it goes to another browser and i want all accounts in one browser can you help me please how to not open a new browser. I don't want them isolated i want one browser and open many tabs with different accounts in it. It used to be like this but by mistake i pressed “open in another browser instead of staying in the same browser and i want to undo the action and cannot find it in your videos. thank you

This is not a good video topic description....because it says "one browser window" - when in fact it has opened multiple windows...you have multiple tabs and therefore you literally have to change from one to another...so you don't have multiples opened in the same window.

Teddy, do you have a video for how you add the existing email accounts to the drop-down menu?

Brilliant! Does this still work? It seems like Chrome changed how account logins worked a few months ago, not long after you published this video.