- Put your dimension in the column shelf
- Put your measure in the size shelf (marks)
- In the mark shelf, select Circle option
You can also adjust other settings, like enlarge the circle's size, add a label, etc.
You have to edit the bubble chart, changing the "Fit" option to "Standard" (instead of "Entire view"). Next, manually dragging the division between two bubble headers in order to fix the width, as shown in the image below.