Add circle is not working the way i want

I was following this tutorial ( and at 3.07 he adds circle mesh to make rectangles turn into circles but when i do the same (i tried every option of circle additions from f3 menu) the circle is on the cursor, the edges of rectangles are selected but it still doesn’t work
what might be the reason? thank you

He isn’t adding a circle mesh, he’s using the LoopTools add-on which has an operator that turns selected edges into circle(s). If you don’t have it enabled, go into Preferences, Add-ons, search for Loop Tools and enable it. After that in edit mode you’ll be able to just right click -> LoopTools -> Circle.

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Thank you so much!